Starting up wikis is so easy nowadays that there's no excuse. I maintain a few Dokuwiki-based ones, it's my preferred engine for simple wiki stuff, but Mediawiki (the same one that powers Wikipedia) is not bad either and not really too difficult, just a bit more demanding storage-wise. Heck, you can currently fire-and-forget DW-based wikis on SDF's "one payment" access tier, even! Probably on Neocities too, haven't checked.