Initial integration of CSS for base WET Theme - Basic styling to allow for pages to look more presentable

* Commenced hooking of existing theme CSS to base pages for WET
* Mobile view is still not functioning since :target CSS and other goodies were not imported
* Desktop view is now rendering with a basic look and feel
* Did a round trip on the .hbs plugin files to add a few variables

I was a bit confused about the role of the layout.hbs in the theme folder, and there mechanics to create add things to the assets folder seems limited to just plugins.