Update readthedocs configuration to recent changes

Copy pasted from the working sdbus configuration.

Author: igo95862

.readthedocs.yml

@@ -1,6 +1,17 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# Copyright (C) 2023 igo95862
+---
+
 version: 2
 
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.9"
+
+sphinx:
+  configuration: "docs/conf.py"
+
 python:
-   version: 3.8
-   install:
-   - requirements: requirements.txt
+  install:
+    - requirements: docs/requirements.txt

docs/conf.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
-# Copyright (C) 2020, 2021 igo95862
+# Copyright (C) 2020-2023 igo95862
 
 # This file is part of python-sdbus
 
@@ -24,6 +24,7 @@
 author = 'igo95862'
 source_suffix = '.rst'
 extensions = ['sdbus.autodoc']
+html_theme = "sphinx_rtd_theme"
 
 autoclass_content = 'both'
 autodoc_typehints = 'description'

docs/requirements.txt

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# Copyright (C) 2023 igo95862
+sphinx_rtd_theme
+sdbus>=0.10.2