There was a mirror at https://kidneybone.com/c2/wiki/ without the SPA stuff, but that seems to be 503'd right now. (And even if it wasn't, I don't think it has a root page; you'd need to type in one of the page URLs manually.)
Huh, my other pages don't have the same issue. I guess the search indexer must've died - I'll restart it in an hour or two.
FWIW, the snapshot of c2 that this runs off of is somewhat dated (https://archive.org/details/c2.com-wiki_201501), so the last ~7 years of updates after the move to the federated wiki aren't present.
Does anyone know where these original pages ended up in fedwiki after the migration?