Use sphinx_rtd_theme

Author: phw

.readthedocs.yaml

@@ -17,6 +17,6 @@ sphinx:
 # Optionally, but recommended,
 # declare the Python requirements required to build your documentation
 # See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
-#    install:
-#    - requirements: docs/requirements.txt
+python:
+   install:
+   - requirements: doc/requirements.txt

doc/conf.py

@@ -67,25 +67,15 @@ def __getattr__(cls, name): return Mock()
 
 # -- Options for HTML output ---------------------------------------------------
 
-html_theme = 'default'
-# force default theme on readthedocs to apply our theme options
-html_style = "/default.css"
-# MusicBrainz colors
+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 = {
-        "footerbgcolor": "#e7e7e7",
-        "footertextcolor": "#444444",
-        "sidebarbgcolor": "#ffffff",
-        "sidebartextcolor": "#000000",
-        "sidebarlinkcolor": "002bba",
-        "relbarbgcolor": "#5c5789",
-        "relbartextcolor": "#000000",
-        "bgcolor": "#ffffff",
-        "textcolor": "#000000",
-        "linkcolor": "#002bba",
-        "headbgcolor": "#ffba58",
-        "headtextcolor": "#515151",
-        "codebgcolor":  "#dddddd",
-        "codetextcolor": "#000000"
+    'collapse_navigation': True,
+    'navigation_depth': 2,
+    'version_selector': True,
 }
 
 html_title = "%s %s documentation" % (project, current)

doc/requirements.txt

@@ -0,0 +1,2 @@
+Sphinx==8.2.3
+sphinx-rtd-theme==3.0.2