Also writing documentation in-code like JavaDoc or equivalents has always seemed great for me. Then you can have your toolchain generate the written documentation directly from that, and it can be updated easily based on what’s actually documented in the code (but that does require that people keep that updated)
You can. I’ve reduced my language list down from the default of “every single one”. You should probably still keep “undetermined” selected as a “language”, otherwise a lot of stuff people haven’t actually tagged with a language won’t show up.