Rebuild of Navigation and Subnav display

[rrusher]

This lazy loads the carousels for each section into the subnav. It also sets up the search input field. It includes event listeners for the nav and subnav. Updated menu to use SVGs.

Fix #2

Test URLs:

• Before: https://main--24life--hlxsites.hlx.page/
• After: https://subnav--24life--hlxsites.hlx.live/

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