Add parts of new Jekyll site.

404.md

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+---
+layout: default
+title: 404 - Page not found
+---
+404 - Page not found
+====================
+Sorry, we couldn’t find the requested URL. You can try again by going [back to the homepage]({{ site.baseurl }}).

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+# gem "rails"
+
+gem "jekyll", "~> 3.8"
+gem "jekyll-paginate"
+gem "jekyll-sitemap"
+gem "jekyll-redirect-from"
+
+
+gem "jekyll-watch", "~> 2.1"
+
+gem "ruby_dep", "~> 1.5"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.6.0)
+      public_suffix (>= 2.0.2, < 4.0)
+    colorator (1.1.0)
+    concurrent-ruby (1.1.4)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.7)
+    ffi (1.10.0)
+    forwardable-extended (2.6.0)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.8.5)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
+      safe_yaml (~> 1.0)
+    jekyll-paginate (1.1.0)
+    jekyll-redirect-from (0.14.0)
+      jekyll (~> 3.3)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-sitemap (1.2.0)
+      jekyll (~> 3.3)
+    jekyll-watch (2.1.2)
+      listen (~> 3.0)
+    kramdown (1.17.0)
+    liquid (4.0.1)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    mercenary (0.3.6)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.0.3)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rouge (3.3.0)
+    ruby_dep (1.5.0)
+    safe_yaml (1.0.4)
+    sass (3.7.3)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  jekyll (~> 3.8)
+  jekyll-paginate
+  jekyll-redirect-from
+  jekyll-sitemap
+  jekyll-watch (~> 2.1)
+  ruby_dep (~> 1.5)
+
+BUNDLED WITH
+   1.17.1

_includes/anchor_headings.html

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+{% capture headingsWorkspace %}
+  {% comment %}
+    Version 1.0.3
+      https://github.com/allejo/jekyll-anchor-headings
+
+    "Be the pull request you wish to see in the world." ~Ben Balter
+
+    Usage:
+      {% include anchor_headings.html html=content %}
+
+    Parameters:
+      * html          (string) - the HTML of compiled markdown generated by kramdown in Jekyll
+
+    Optional Parameters:
+      * beforeHeading (bool)   : false  - Set to true if the anchor should be placed _before_ the heading's content
+      * anchorBody    (string) :  ''    - The content that will be placed inside the anchor; the `%heading%` placeholder is available
+      * anchorClass   (string) :  ''    - The class(es) that will be used for each anchor. Separate multiple classes with a space
+      * anchorTitle   (string) :  ''    - The `title` attribute that will be used for anchors
+      * h_min         (int)    :  1     - The minimum header level to build an anchor for; any header lower than this value will be ignored
+      * h_max         (int)    :  6     - The maximum header level to build an anchor for; any header greater than this value will be ignored
+      * bodyPrefix    (string) :  ''    - Anything that should be inserted inside of the heading tag _before_ its anchor and content
+      * bodySuffix    (string) :  ''    - Anything that should be inserted inside of the heading tag _after_ its anchor and content
+
+    Output:
+      The original HTML with the addition of anchors inside of all of the h1-h6 headings.
+  {% endcomment %}
+
+  {% assign minHeader = include.h_min | default: 1 %}
+  {% assign maxHeader = include.h_max | default: 6 %}
+  {% assign beforeHeading = include.beforeHeading %}
+  {% assign nodes = include.html | split: '<h' %}
+
+  {% capture edited_headings %}{% endcapture %}
+
+  {% for _node in nodes %}
+    {% capture node %}{{ _node | strip }}{% endcapture %}
+
+    {% if node == "" %}
+      {% continue %}
+    {% endif %}
+
+    {% assign nextChar = node | replace: '"', '' | strip | slice: 0, 1 %}
+    {% assign headerLevel = nextChar | times: 1 %}
+
+    <!-- If the level is cast to 0, it means it's not a h1-h6 tag, so let's try to fix it -->
+    {% if headerLevel == 0 %}
+      {% if nextChar != '<' and nextChar != '' %}
+        {% capture node %}<h{{ node }}{% endcapture %}
+      {% endif %}
+
+      {% capture edited_headings %}{{ edited_headings }}{{ node }}{% endcapture %}
+      {% continue %}
+    {% endif %}
+
+    {% assign _workspace = node | split: '</h' %}
+    {% assign _idWorkspace = _workspace[0] | split: 'id="' %}
+    {% assign _idWorkspace = _idWorkspace[1] | split: '"' %}
+    {% assign html_id = _idWorkspace[0] %}
+
+    {% capture _hAttrToStrip %}{{ _workspace[0] | split: '>' | first }}>{% endcapture %}
+    {% assign header = _workspace[0] | replace: _hAttrToStrip, '' %}
+
+    <!-- Build the anchor to inject for our heading -->
+    {% capture anchor %}{% endcapture %}
+
+    {% if html_id and headerLevel >= minHeader and headerLevel <= maxHeader %}
+      {% capture anchor %}href="#{{ html_id}}"{% endcapture %}
+
+      {% if include.anchorClass %}
+        {% capture anchor %}{{ anchor }} class="{{ include.anchorClass }}"{% endcapture %}
+      {% endif %}
+
+      {% if include.anchorTitle %}
+        {% capture anchor %}{{ anchor }} title="{{ include.anchorTitle | replace: '%heading%', header }}"{% endcapture %}
+      {% endif %}
+
+      {% capture anchor %}<a {{ anchor }}>{{ include.anchorBody | replace: '%heading%', header | default: '' }}</a>{% endcapture %}
+
+      <!-- In order to prevent adding extra space after a heading, we'll let the 'anchor' value contain it -->
+      {% if beforeHeading %}
+        {% capture anchor %}{{ anchor }} {% endcapture %}
+      {% else %}
+        {% capture anchor %} {{ anchor }}{% endcapture %}
+      {% endif %}
+    {% endif %}
+
+    {% capture new_heading %}
+      <h{{ _hAttrToStrip }}
+        {{ include.bodyPrefix }}
+        {% if beforeHeading %}
+          {{ anchor }}{{ header }}
+        {% else %}
+          {{ header }}{{ anchor }}
+        {% endif %}
+        {{ include.bodySuffix }}
+      </h{{ _workspace | last }}
+    {% endcapture %}
+    {% capture edited_headings %}{{ edited_headings }}{{ new_heading }}{% endcapture %}
+  {% endfor %}
+{% endcapture %}{% assign headingsWorkspace = '' %}{{ edited_headings | strip }}

_includes/footer.html

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+<footer><span></span></footer>

_includes/head-doc.html

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+<head>
+	<!-- Meta -->
+	<meta charset="UTF-8"/>
+	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1">
+	<meta name="generator" content="Jekyll">
+
+	<title>{%if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
+  <meta name="description" content="{%if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">
+
+	<!-- CSS & fonts -->
+	<link rel="stylesheet" href="{{ "/css/main.css" | prepend: site.baseurl | replace: '//', '/' }}">
+	<link rel="stylesheet" href="{{ "/css/docs.css" | prepend: site.baseurl | replace: '//', '/' }}">
+
+	<!-- RSS -->
+	<link href="/atom.xml" type="application/atom+xml" rel="alternate" title="ATOM Feed" />
+
+  <!-- Favicon -->
+  <link rel="shortcut icon" type="image/png" href="img/favicon.png">
+
+</head>

_includes/head.html

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+<head>
+	<!-- Meta -->
+	<meta charset="UTF-8"/>
+	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1">
+	<meta name="generator" content="Jekyll">
+
+	<title>{%if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
+  <meta name="description" content="{%if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">
+
+	<!-- CSS & fonts -->
+	<link rel="stylesheet" href="{{ "/css/main.css" | prepend: site.baseurl | replace: '//', '/' }}">
+
+	<!-- RSS -->
+	<link href="/atom.xml" type="application/atom+xml" rel="alternate" title="ATOM Feed" />
+
+  <!-- Favicon -->
+  <link rel="shortcut icon" type="image/png" href="img/favicon.png">
+
+</head>

_includes/header-custom.html

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+<header id="header">
+
+	<!-- Your custom header here -->
+
+</header>

_includes/header.html

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+<div id="ens_header">
+<div id="ens_header_row">
+  <div id="ens_header_cell_logo_img"><a href="{{ site.baseurl }}"><img
+id="ens_logo_img" src="{{ site.baseurl }}/img/mlpack_logo.png" alt="ensmallen" align="top" border="0"></a></div>
+    <div id="ens_header_spacer"></div>
+    <div id="ens_header_cell_logo_txt"><big><big><b>mlpack</b></big><br>fast,
+flexible C++ machine learning library</big></div>
+  </div>
+  </div>
+  <div id="nav-links">
+      <!-- Nav pages -->
+    {% assign sorted_pages = site.pages | sort:"order" %}
+    {% if page.layout == "docs" %}
+      {% for node in sorted_pages %}
+        {% if node.layout == "default-nav" or node.layout == "docs-nav" %}
+          {% if node.title == "Documentation" %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}.html" class="active" title="{{ node.title }}">{{ node.title }}</a>
+          {% else %}
+            {% if node.title == "Home" %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}" title="{{ node.title }}">{{ node.title }}</a>
+            {% else %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}.html" title="{{ node.title }}">{{ node.title }}</a>
+            {% endif %}
+          {% endif %}
+        {% endif %}
+      {% endfor %}
+    {% else %}
+      {% for node in sorted_pages %}
+        {% if node.layout == "default-nav" or node.layout == "docs-nav" %}
+          {% if node.url == page.url %}
+            {% if node.title == "Home" %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}" class="active" title="{{ node.title }}">{{ node.title }}</a>
+            {% else %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}.html" class="active" title="{{ node.title }}">{{ node.title }}</a>
+            {% endif %}
+          {% else %}
+            {% if node.title == "Home" %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}" title="{{ node.title }}">{{ node.title }}</a>
+            {% else %}
+            <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}.html" title="{{ node.title }}">{{ node.title }}</a>
+            {% endif %}
+          {% endif %}
+        {% endif %}
+      {% endfor %}
+    {% endif %}
+  </div>

_includes/mathjax.html

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+{% if page.mathjax %}
+<script type="text/x-mathjax-config">
+  MathJax.Hub.Config({
+    tex2jax: {
+      inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+      processEscapes: true
+    }
+  });
+</script>
+<script
+  type="text/javascript"
+  charset="utf-8"
+  src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"
+>
+</script>
+<script
+  type="text/javascript"
+  charset="utf-8"
+  src="https://vincenttam.github.io/javascripts/MathJaxLocal.js"
+>
+</script>
+{% endif %}

_includes/menu.html

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+<nav {% if site.reverse == true %}id="nav-left"{% else %}id="nav"{% endif %}>
+  <div id="nav-list">
+    <!-- Nav pages -->
+    {% assign sorted_pages = site.pages | sort:"order" %}
+    {% for node in sorted_pages %}
+      {% if node.layout == "default-nav" %}
+        {% if node.url == page.url %}
+          {% if node.title == "Home" %}
+          <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}" class="active" title="{{ node.title }}">{{ node.title }}</a>
+          {% else %}
+          <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}.html" class="active" title="{{ node.title }}">{{ node.title }}</a>
+          {% endif %}
+        {% else %}
+          {% if node.title == "Home" %}
+          <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}" title="{{ node.title }}">{{ node.title }}</a>
+          {% else %}
+          <a href="{% if site.baseurl == "/" %}{{ node.url }}{% else %}{{ node.url | prepend: site.baseurl }}{% endif %}.html" title="{{ node.title }}">{{ node.title }}</a>
+          {% endif %}
+        {% endif %}
+      {% endif %}
+    {% endfor %}
+  </div>
+
+  <!-- Nav footer -->
+  {% if site.custom_nav_footer == true %}
+    {% include nav-footer-custom.html %}
+  {% else %}
+    {% include nav-footer.html %}
+  {% endif %}
+</nav>

_includes/nav-footer-custom.html

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+<footer>
+
+	<!-- Your custom nav footer here -->
+
+</footer>

_includes/nav-footer.html

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+<footer>
+
+	<span>version {{ site.version }}</span>
+
+</footer>

_includes/script.html

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+<script src="{{ "/js/main.js" | prepend: site.baseurl | replace: '//', '/' }}"></script>