This project demonstrates having multiple .readthedocs.yaml files in the same repository in order to host nested documentation subprojects on Read the Docs.
You can read about the feature here:
https://docs.readthedocs.io/en/stable/guides/setup/monorepo.html
The feature is new (read: experimental).
This is an example of a Monorepo with 3 projects. Each project isn't highly developed nor pretty.
This is the "main" project that nests other subprojects. It uses the latest version of Sphinx.
Completely different type of project. Builds with Sphinx 5.x.
Configured to be added as a subproject with alias "blog"
This project uses a completely different build environment with Node.
Configured to be added as a subproject with alias "docusaurus"