Remove Fedora Badges docs and edit README to point to new home
    
    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
    3. https://pagure.io/fedora-badges
    4. https://pagure.io/fedora-badges/docs
    5. https://gitlab.com/fedora/docs/docs-website/docs-fp-o/-/tree/prod?ref_type=heads
    
    Signed-off-by: Justin W. Flory (he/him) <jwf@redhat.com>