Migrate docs site from pods to normal layout w/ colocated components

[maxfierke]

The tests/dummy app that powers the docs site is still using pods and it would be great to get it onto a more supported Ember layout

Ideally, we could keep some of the nice component organization of pods, using component colocation, but without the downsides of pods (somewhat unsupported, everything being called "component.{js,hbs}")