A couple more are listed in the Guide for new ActivityPub implementers: Federation.md paragraph.
Can, or might generate? Didn’t see code that does that now. But it is good idea, and can serve to keep project-specific federation docs decentralized and within its own codebase.
The delightful-club project by @yarmo gathers decentralized README.md from sub-list repositories using Codeberg CI to build: https://delightful.club