shell: Remove sidebar styling, since we don't have a sidebar anymore

Closes #1573
Reviewed-by: Stef Walter <stefw@redhat.com>
base: Distribute mustache and bring it into base package

This is a simple templating library that fits quite well with jQuery
and our method of operation. We don't currently do incremental DOM
updates, but that will come in a later iteration.
shell: Use Mustache to render the Servers on the dashboard

Note that we can't use .data() with data-* attributes as these
may change underneath jQuery.

Closes #1566