Add .readthedocs.yaml configuration
This is required by Read the Docs service: https://blog.readthedocs.com/migrate-configuration-v2/
This instance will be upgraded to Heptapod 17.0.0 (final) on 2024-06-27 at 18:00 UTC+2
This is required by Read the Docs service: https://blog.readthedocs.com/migrate-configuration-v2/