Docs switches to vuepress!! (#471)

* updating to get rid of old docs

* better colors

docs/.vuepress/config.js

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+module.exports = {
+  title: "just ___",
+  description: "The task library that just works",
+  base: "/just/",
+  themeConfig: {
+    nav: [
+      { text: "Home", link: "/" },
+      { text: "Guide", link: "/guide/" },
+      { text: "Github", link: "https://github.com/microsoft/just" },
+    ],
+    sidebar:  [
+      {
+        title: 'Home',   // required
+        path: '/',      // optional, link of the title, which should be an absolute path and must exist
+      },
+      {
+        title: 'Tasks',
+        path: '/tasks',
+        collapsable: false,
+        sidebarDepth: 1,
+        children: [ '/tasks/composition', '/tasks/logging', '/tasks/args', '/tasks/condition', '/tasks/thunk' ]
+      },
+      {
+        title: 'Scripts',
+        path: '/scripts',
+        collapsable: false,
+        sidebarDepth: 1,
+        children: [ '/scripts/typescript', '/scripts/webpack', '/scripts/lint', '/scripts/jest' ]
+      }
+    ]
+  },
+
+  plugins: [
+    [
+      "mermaidjs",
+      {
+        gantt: {
+          barHeight: 20,
+          fontSize: 12,
+          useWidth: 960,
+        },
+      },
+    ],
+  ],
+};

docs/.vuepress/public/.nojekyll

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+Keep

docs/.vuepress/styles/palette.styl

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+$contentWidth ?= 960px
+$accentColor = #000080

docs/README.md

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+---
+home: true
+# heroImage: /hero.png
+heroText: The task library that just works
+tagline: A sensible set of task to build, test, and lint your frontend projects
+actionText: Get Started →
+actionLink: /tasks/
+features:
+  - title: Flexible
+    details: 'Unlike create-react-app, just gives sensible defaults but does not hide config files'
+  - title: Task orchestration
+    details: Like gulp, just provides parallel() and series() to fine tune task runs
+  - title: No waiting for latest devDependencies
+    details: just-scripts knows how to run tools, but it does not prescribe versions of the dependencies - you upgrade at your own timing!
+  - title: TypeScript suport
+    details: just-scripts configurations are TypeScript-enabled, so you don't have to have a separate build step to use your build tools
+  - title: Lightweight task orchestration
+    details: just-task is a lightweight task orchestrator that has no streaming file system abstraction
+  - title: Battle tested
+    details: just is built upon just the right abstraction from the gulp ecosystem, which is used by many repos
+
+footer: MIT Licensed | Copyright © 2020-present Microsoft
+---