footer: Refactor and update URLs
    
    This commit reworks most of the data used in the footer of the Flock
    website. Notable changes:
    
    * Add more Fedora social media channels
    * Update docs links for Fedora Project overview and Fedora Legal
    * Add more Fedora Linux editions
    * Fix links to Fedora Linux downloads with the new websites from F38
    * Update links for getting support to relevant docs or landing places
    * Update copyright year
    
    Signed-off-by: Justin W. Flory (he/him) <jwf@redhat.com>