Add a real landing page for releasehx.docopslab.org

Right now there's just a very plain, untitled "home page" at https://releasehx.docopslab.org.

This should be at least somewhat of a modern looking landing page. It doesn't have to be as nice as https://docopslab.org, and it might still be largely sourced from the README, for now, but it should at least link to the docs. There's nothing framing this as a homepage now, and it's awkward.