doc: use sphinx-rtd-theme (#575)

.github/workflows/docs.yaml

@@ -24,7 +24,6 @@ jobs:
         run: |
           pip install -r requirements.txt
           make cython
-          pip install .
 
       - name: Sphinx Documentation Generator
         run: |

.readthedocs.yaml

@@ -18,6 +18,7 @@ python:
   install:
     - method: pip
       path: .
+    - requirements: docs/requirements.txt
 
 sphinx:
   configuration: docs/conf.py

docs/conf.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # msgpack documentation build configuration file, created by
 # sphinx-quickstart on Sun Feb 24 14:20:50 2013.
 #
@@ -91,7 +89,7 @@ pygments_style = "sphinx"
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = "sphinxdoc"
+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

docs/requirements.txt

@@ -0,0 +1,2 @@
+sphinx~=7.2
+sphinx-rtd-theme~=1.3.0

tox.ini

@@ -33,6 +33,6 @@ commands=
 [testenv:sphinx]
 changedir = docs
 deps =
-    sphinx
+    -r docs/requirements.txt
 commands =
     sphinx-build -n -v -W --keep-going -b html -d {envtmpdir}/doctrees . {envtmpdir}/html