use sphinx-rtd-theme

docs/en/rst/_static/bugzilla.css

@@ -1,21 +1,5 @@
-@import 'default.css';
-
-dt { font-weight: bold; }
-
-/* Custom roles */
-.param    { font-weight: bold; }
-.paramval { font-family: monospace; }
-.group    { font-family: monospace; }
-.field    { font-weight: bold; }
-.command  { font-family: monospace; font-size: 130% }
-
-.admonition-todo {
-  background-color: lightpink;
-  border: 2px darkred solid;
-}
-
-/* Make Buggie's antenna not take up so much space */
-.logo {
-  display: block;
-  margin-top: -20px;
+.wy-side-nav-search .wy-dropdown > a img.logo,
+.wy-side-nav-search > a img.logo {
+  min-width: 150px;
+  width: 350px;
 }

docs/en/rst/conf.py

@@ -128,12 +128,31 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+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 = {
+    #'analytics_id': 'G-XXXXXXXXXX',  #  Provided by Google in your dashboard
+    #'analytics_anonymize_ip': False,
+    'logo_only': True,
+    'display_version': True,
+    'prev_next_buttons_location': 'bottom',
+    'style_external_links': False,
+    'vcs_pageview_mode': '',
+    #'style_nav_header_background': 'white',
+    # Toc options
+    'collapse_navigation': True,
+    'sticky_navigation': True,
+    'navigation_depth': 4,
+    'includehidden': True,
+    'titles_only': False
+}
+
+html_css_files = [
+    "bugzilla.css"
+]
 
 # Add any paths that contain custom themes here, relative to this directory.
 #html_theme_path = []
@@ -145,11 +164,11 @@
 # A shorter title for the navigation bar.  Default is the same as html_title.
 #html_short_title = None
 
-html_style = "bugzilla.css"
+#html_style = "bugzilla.css"
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-html_logo = "../images/bugzilla.png"
+html_logo = "../images/bugzilla-logo-white.svg"
 
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32

docs/requirements.txt

@@ -0,0 +1,3 @@
+sphinx==5.3.0
+sphinx_rtd_theme==1.3.0
+readthedocs-sphinx-search==0.3.1