Do you know of some good options?
If devs like it I’m sure they will contribute to make a legit docs site for it.
Good way to start imo that has zero friction (for you) and I wouldn’t personally mind it since you get public URL’s.
Or use Codex or CC to make a markdown site hosted on GitHub io
- https://squidfunk.github.io/mkdocs-material/
They're both used by hundreds of open source projects, are pretty easy to set up, and use markdown for content so you shouldn't have any trouble.