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.