Adding initial styling from first round design

Styles still a work in progress, but dropped in:
- updated color palette
- Source Sans Pro (from Google fonts)
- broke out a few new dedicated includes from the module scss file
- added new $base variables to use for margin and padding values
- HTML changes: added link to google fonts, moved order of h1, updated
the breadrumb nav to be a ul>li>a instead of loose anchor elements