Adding some more repodata.
    
    The DVD image, traditionally used as the repodata source for the technical notes,
    may be going away with Fedora.next.  The different Fedora products also make
    that repodata source less relevant. This commit includes repodata from the "Everything"
    repo of both F20 and F21.
    
    Note that F21 was recently branched, and the committed f21 repodata is pre-aplha.
    This repodata should be *replaced* after the alpha release.