ReadTheDocs new configuration file.

.readthedocs.yaml

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+# 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/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats:
+  - pdf
+
+# Python requirements required to build your documentation
+python:
+  install:
+    - requirements: docs/requirements.txt

docs/requirements.txt

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+sphinx
+sphinx_rtd_theme