Thanks for your input everybody.
@Tod, yep your situation looks a lot like hours, except mix in a creaky old wiki too. I've always liked Wagtail. Sadly our own main web platform cannot handle this use case.
We do have access to Teams, we use it often for collaboration. I'd never considered it for documentation. Hmm.
@Sasha, PLIX looks super neat, I just signed up for their mailing list. I'm now kind of trying to fit Notion into my head, it doesn't quite fit. :) Anyways I'll definitely put this one into the mix, thanks. Airtable didn't occur to me; do you use at a department level or something?
@Margaret, +1 Markdown. Yeah, I would super love something like MkDocs, but then I would have to do ALL the work. :)
@Anne, maybe we can convince Margaret to talk about it at our next Chicago Code4Lib meetup, whenever that turns out to be.
Cheers,
-Allan