Fedora Websites: Swap git repositories used for source content
    
    This commit corresponds with the following Fedora W&A docs Pull Request:
    
    > https://pagure.io/fedora-websites/pull-request/1113
    
    Once the above Pull Request is merged, the updated content for the
    Fedora Websites & Apps team can be sourced from that repository, and the
    old repository may be retired. This Pull Request makes the change to
    Fedora's Antora config so the documentation will be served from the
    expected place.
    
    Do **NOT** merge this Pull Request/commit before the above Pull Request
    is merged.
    
    Signed-off-by: Justin W. Flory (he/him) [Fedora Project] <jwf@fedoraproject.org>