511036e coreos: remove jumbotron class from stream select area

Authored and Committed by rfairley 4 years ago
    coreos: remove jumbotron class from stream select area
    
    This avoids rendering the buttons around the
    stream/artifacts selection as grey, leaving it to
    match with the color of the theme.
    
    Signed-off-by: Robert Fairley <rfairley@redhat.com>