Add footer elements to page template

* MSA logo
* MSA shoutout microcopy
* License microcopy
* Footer element styles

The template currently just hard codes these elements and
doesn't print any blocks that may be assigned to the footer region.
In the future, it may be desirable to create custom blocks for these
elements so they can be configured by site admins/builders.

Addresses #3551
Typography styles

* Headings
* Breadcrumbs
* Buttons
* Links

Addresses #3551