Update CentOS Logotypes. Go back into Denmark use for release number
    on CentOS release brands. 
          
        - I've been testing bookman typography for release numbers and the
          result in RHGB is awful. It is true that number looks better
          with URW Bookman L than Denmark typography, but the visual
          isolation introduced by typography difference between CentOS
          word and release number makes me feel like the connection
          between CentOS word and release number is completly lost, and
          that is something I would like to avoid.
    
        - Remove unused SVG definitions.
        
        - Update metadata information.