Change header links in logo

[nikdragovic]

Based on user testing, linking pattern should be adjusted to conform to Libraries website / pattern library.

Acceptance Criteria

• [x] Shield icon links to Home (digital.library.emory.edu)
• [x] "Emory University" links to emory.edu
• [x] "Emory Libraries" links to libraries.emory.edu

[bwatson78]

PR made: https://github.com/emory-libraries/dlp-lux/pull/640