ci: Add ReadTheDocs configuration

Author: jmgate

.readthedocs.yaml

@@ -0,0 +1,25 @@
+# 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 need.
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.12"
+
+# Build documentation in the "doc/" directory with Sphinx.
+sphinx:
+  fail_on_warning: true
+  configuration: doc/source/conf.py
+
+# Declare Python requirements for building the documentation.
+python:
+  install:
+    - method: pip
+      path: .
+    - requirements: requirements.txt
+    - requirements: doc/requirements.txt