Fix Read the Docs build

Author: MtkN1

.readthedocs.yaml

@@ -0,0 +1,34 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+    # You can also specify other tool versions:
+    # nodejs: "19"
+    # rust: "1.64"
+    # golang: "1.19"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: docs/source/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+# formats:
+#    - pdf
+#    - epub
+
+# Optional 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/source/requirements.txt
+   - method: pip
+     path: .

docs/source/conf.py

@@ -64,7 +64,7 @@
 # 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'
 
 # 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,

docs/source/requirements.txt

@@ -0,0 +1,2 @@
+sphinx
+sphinx-rtd-theme

tox.ini

@@ -39,7 +39,7 @@ commands =
 
 [testenv:docs]
 deps =
-    sphinx
+    -r docs/source/requirements.txt
 allowlist_externals = make
 changedir = {toxinidir}/docs
 commands =