Fix issues with day & night modes in python docs (#613)

Porting the fixes from rapidsai/cudf#11400

Authors:
  - Michael Wang (https://github.com/isVoid)

Approvers:
  - GALI PREM SAGAR (https://github.com/galipremsagar)
  - Mark Harris (https://github.com/harrism)

URL: #613

cpp/doxygen/Doxyfile

@@ -1137,7 +1137,7 @@ HTML_HEADER            =
 # that doxygen normally uses.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_FOOTER            =
+HTML_FOOTER            = footer.html
 
 # The HTML_STYLESHEET tag can be used to specify a user-defined cascading style
 # sheet that is used by each HTML page. It can be used to fine-tune the look of
@@ -1162,7 +1162,7 @@ HTML_STYLESHEET        =
 # list). For an example see the documentation.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_STYLESHEET  = rapids.css
+HTML_EXTRA_STYLESHEET  =
 
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note

cpp/doxygen/footer.html

@@ -0,0 +1,4 @@
+<!-- Copyright (c) 2022, NVIDIA CORPORATION. -->
+
+<script src="https://docs.rapids.ai/assets/js/custom.js"></script>
+<link rel="stylesheet" href="https://docs.rapids.ai/assets/css/custom.css">

docs/source/conf.py

@@ -39,7 +39,6 @@
     "sphinx.ext.autodoc",
     "sphinx.ext.autosummary",
     "numpydoc",
-    "sphinx_markdown_tables",
     "IPython.sphinxext.ipython_console_highlighting",
     "IPython.sphinxext.ipython_directive",
     "nbsphinx",
@@ -79,7 +78,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en-US"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
@@ -197,4 +196,5 @@
 
 
 def setup(app):
-    app.add_css_file("params.css")
+    app.add_css_file("https://docs.rapids.ai/assets/css/custom.css")
+    app.add_js_file("https://docs.rapids.ai/assets/js/custom.js")