💄 Use different footer

[kirkkwang]

This commit will use the Rivet footer with resource links as the foundation and adjust the resource links to point to the static pages for this application. The old footer and accompanying styles and partials have been removed as well.

Ref:

• https://rivet.iu.edu/components/footer/?example=footer-with-resource-links
• https://github.com/scientist-softserv/archives_online/issues/26