Delete unused images.

docs/resources/simplesamlphp-sp/saml2metadata-feide.png

docs/resources/simplesamlphp-sp/saml2metadata.png

modules/InfoCard/www/resources/demoimage_no_indexada.png

modules/discopower/www/icons/arrow_right.png

www/resources/icons/bino.png

www/resources/icons/bomb_l.png

www/resources/icons/compass_l.png

www/resources/icons/debug.png

www/resources/icons/gn/notice-l.png

www/resources/icons/gn/stop-l.png

www/resources/icons/gn/success-l.png

www/resources/icons/gn/warning-l.png

www/resources/icons/lock.png

www/resources/icons/openid.png

www/resources/icons/service.png

www/resources/icons/silk/cancel.png

www/resources/icons/silk/control_pause.png

www/resources/icons/silk/tick.png