Visuals

The beginning of visual parity with @dmdj03's mocks for the dashboard.

Included in the pull-request:

* Font styles as defined in #6 (completes #8)
* Site scaffolding as defined in #6 (completes #12)
* Modal popup look and feel as defined in #6 (completes #14)
* Less / CSS files (completes #13)

Still to be done:

* Search drop-down behavior
* Side navigation
* Page content styling