silhuette -> silhouette

Signed-off-by: Pekka Klärck <peke@iki.fi>
silhuette -> silhouette, part 2

Signed-off-by: Pekka Klärck <peke@iki.fi>
Attribution to http://sweetclipart.com for the original robot image

Signed-off-by: Pekka Klärck <peke@iki.fi>