Fix ReadTheDocs build

Add .readthedocs.yaml, move conf.py into the standard location,
install sphinx_rtd_theme, and enable the sphinx_rtd_theme extension.

Author: miek

.readthedocs.yaml

@@ -0,0 +1,31 @@
+# .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 version of Python and other tools you might need
+build:
+   os: ubuntu-22.04
+   tools:
+     python: "3.10"
+     # You can also specify other tool versions:
+     # nodejs: "16"
+     # rust: "1.55"
+     # golang: "1.17"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: docs/conf.py
+
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+# formats:
+#    - pdf
+
+# Optionally declare the Python requirements required to build your docs
+python:
+   install:
+   - requirements: docs/requirements.txt
+   - method: pip
+     path: .

docs/source/conf.py docs/conf.pydocs/source/conf.py renamed to docs/conf.py

@@ -7,7 +7,8 @@
 # -- General configuration ---------------------------------------------------
 
 extensions = [
-    'sphinx.ext.autodoc'
+    'sphinx.ext.autodoc',
+    'sphinx_rtd_theme'
 ]
 
 templates_path = ['_templates']

docs/requirements.txt

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