Update RTD integration

.readthedocs.yaml

@@ -0,0 +1,22 @@
+# Read the Docs configuration file for Sphinx projects
+# 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: "3.10"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: docs/source/conf.py
+
+# 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/requirements-docs.txt

docs/requirements-docs.txt

@@ -1,2 +1,4 @@
-sphinx==1.8.5
-sphinx_rtd_theme
+docutils==0.16.0
+jinja2==3.0.0
+sphinx==3.4
+sphinx_rtd_theme==1.3.0