An HTML prototype

Kicking off some extraordinarily basic prototyping. This is a **work in progress** pull request, not ready for merging.

@vz3, you should feel free to hop on this `prototype` branch any time. I have [Pure CSS](http://purecss.io) downloaded and included in some basic templating.

Note that I renamed the repo from `foia-portal` to `foia-hub`, because everyone hates the word "portal". All redirects, including git redirects, should function properly and automatically.