Introduce .readthedocs.yaml (#888)

This PR adds the new Read the Docs configuration file to the documentation.

.readthedocs.yaml

@@ -0,0 +1,26 @@
+# 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 and Python version
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in with Sphinx
+sphinx:
+  configuration: doc/manual/source/conf.py
+
+# Build PDF & ePub
+formats:
+  - epub
+  - pdf
+
+# Declare the Python requirements required # to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+  install:
+    - requirements: doc/manual/source/requirements.txt