fix(lccf): align cms menu nav link via Core-Styles

[wesleyboar]

Overview

Rely on Core-Styles to fix CMS menu .nav-link alignment.

Related

• fixes & simplifies fix(lccf): cms menu .nav-link alignment #409
• requires fix: s-header nav-link alignment inconsistent Core-Styles#427

Changes

• deletes code that Core-Styles now gives
• deletes obvious comments

Testing

1. Deploy/Replicate on https://pprd.lccf-portal.tacc.utexas.edu/.
2. View when navbar is expanded.
   1. Verify .nav-link underline is at bottom of header.
   2. Verify .nav-link text is vertically aligned center with search bar.
3. View when navbar is collapsed.
   1. Verify .nav-links are not too close to each other.

UI

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