flock: Add link to Fedora Project overview
    
    This commit makes two changes:
    
    * Add a link to the Fedora Project overview on docs.fedoraproject.org to
      give more context to what Fedora is for a first-time visitor
    * Changed a line to "typically alternates" between NA and EU since this
      year and last year were back-to-back in Europe
    
    Including the project overview URL should also give a boost, however
    small, to the SEO presence of the Fedora Docs website.