I was actually specifically thinking of a MediaWiki instance. In this case there wasn't a codebase to version control so I didn't think of github and gitlab as

I was actually specifically thinking of a MediaWiki instance. In this case there wasn't a codebase to version control so I didn't think of github and gitlab as options but maybe that makes sense. I don't know about tiddlywiki -- does that work for collaboration? It says "personal web notebook" so I sort of assumed it wouldn't have the multi user admin setup that mediawiki does.