Add dark mode feature in documentation (AtsushiSakai#842)

Author: Faizan-Alam-1

docs/conf.py

@@ -46,6 +46,7 @@
     'sphinx.ext.imgconverter',
     'IPython.sphinxext.ipython_console_highlighting',
     'sphinx_copybutton',
+    'sphinx_rtd_dark_mode',
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -86,7 +87,7 @@
 if on_rtd:
     html_theme = 'default'
 else:
-    html_theme = 'sphinx_rtd_theme'
+    html_theme = 'sphinx_rtd_light_them'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the

docs/doc_requirements.txt

@@ -3,3 +3,4 @@ sphinx_rtd_theme == 1.0.0
 IPython == 8.10.0 # For sphinx documentation
 sphinxcontrib-napoleon == 0.7 # For auto doc
 sphinx-copybutton
+sphinx-rtd-dark-mode