add sphinx_rtd_theme for readthedocs

source/conf.py

@@ -79,13 +79,27 @@ pygments_style = 'sphinx'
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+# html_theme = 'alabaster'
+html_theme = 'sphinx_rtd_theme'
 
 # 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
 # documentation.
 #
-# html_theme_options = {}
+html_theme_options = {
+        'canonical_url': '',
+        'analytics_id': '',  #  Provided by Google in your dashboard
+        'logo_only': False,
+        'display_version': True,
+        'prev_next_buttons_location': 'bottom',
+        'style_external_links': False,
+        # Toc options
+        'collapse_navigation': True,
+        'sticky_navigation': True,
+        'navigation_depth': 4,
+        'includehidden': True,
+        'titles_only': False
+        }
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,