Add optional note above the login / register box
    
    This adds an additional macro that appears above the login / register
    box on the unlogged in main page. The FAS theme also now uses this box
    to inform users that if they use a Fedora account, they must adhere to
    the Fedora Code Of Conduct.
    
    This also slightly tweaks the links for sync token and forgotten
    password to clean them up a littel bit.
    
    Resolves: #495
    
    Signed-off-by: Ryan Lerch <rlerch@redhat.com>