Download-friendly documentation/codex

I spend a lot of time with my laptop on a train without a net connection. I could really use some offline documentation. Is there a way to download the documentation/codex so I can browse it locally?

I tried mirroring codex.www.remarpro.com but the pages don’t open nicely in the browser because it has no .html extenstion so it is treated like text/plain which is no good.

Any suggestions?