Initial styling and an interation on lender search initial page

Cleans up the initial institution search page. 
* Adds the CFPB header (if cfpbstyle is active)
* Adds an explicit option for searching by lender id
* Adds a link to the NIC search

Removed the search form object, as we can just use GET, and we can do validation in JS.

This continues the terrible precedent of importing cfpb.github.io's CSS. Will fix this in a later version.