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.)
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?
For those reading the comments here, https://kidneybone.com/c2/wiki/CategoryCategory is a great place to start browsing.