Bug 1070001: Re-org Stylus - demo studio

Moved the demo studio CSS into the redesign folder.

Broke CSS into smaller files using the existing comments as a guide. Some of these are components (the way I want to organize files in the future) but some of them are not. Weird mish-mash, sorry.

Updated font declarations to be closer to the bulletproof syntax but we lack .svg versions of them.