Remove remnants of Fedora Badges docs and point to the new home
    
    This commit cleans up leftover files from the Fedora Badges Antora docs
    and updates the README to now point to the GitLab repository used for
    managing and maintaining the documentation.
    
    This is being done to better unify content and information about Badges
    into one singular place. This commit will correspond with others in
    related repositories:
    
    1. https://gitlab.com/fedora/websites-apps/fedora-badges/docs/-/merge_requests/1
    2. https://gitlab.com/fedora/websites-apps/documentation/-/merge_requests/2
    3. https://pagure.io/fedora-badges
    4. https://pagure.io/fedora-badges/docs/pull-request/7
    5. https://gitlab.com/fedora/docs/docs-website/docs-fp-o/-/merge_requests/8
    
    Signed-off-by: Justin W. Flory (he/him) <jwf@redhat.com>