@xyhhx#Tiddlywiki sounds fit (the web page can save itself back to the server if it is on a WebDAV folder). But it can't be edited concurrently (maybe its https://noteself.org variant can). #Etherpad or #Cryptpad or #CodiMD are less like wiki and more like Goggle Docs. This is a user's viewpoint, not a hoster's.
lookin for recommendations for documentation/wikis/etc that i can use for my homelab/one-day community server!
ideally it'll be either something very minimal and js-free (in the vein of man.sr.ht) or something hacker-vibe where js frontends can be excused if it's for a cool reason (like silverbullet.md)
this doesn't have to be extremely accessible to non-tech savvy users, but shouldn't be too much more complicated than editing markdown files etc