#python stdlib has a generated code documenter shoved into it: #pydoc. It has a lot of design problems, top of which is that it works poorly as a pure CI task to generate static HTML.
I forked it and made it at least usable, albeit still ugly.
https://github.com/matthewdeanmartin/pydoc_fork
Next step would be to use modern website templating. Maybe if it ever got attention & I felt peer pressure to improve it again.