Remove site_media no longer needed

steering/site_media/buttons/default-11.png

steering/site_media/buttons/default-17.png

steering/site_media/js/calendar/CHANGELOG.txt

steering/site_media/js/calendar/CONTRIBUTING.txt

steering/site_media/js/calendar/LICENSE.txt

steering/site_media/js/calendar/demos/agenda-views.html

steering/site_media/js/calendar/demos/background-events.html

steering/site_media/js/calendar/demos/basic-views.html

steering/site_media/js/calendar/demos/default.html

steering/site_media/js/calendar/demos/external-dragging.html

steering/site_media/js/calendar/demos/gcal.html

steering/site_media/js/calendar/demos/json.html

steering/site_media/js/calendar/demos/json/events.json

steering/site_media/js/calendar/demos/list-views.html

steering/site_media/js/calendar/demos/locales.html

steering/site_media/js/calendar/demos/php/get-events.php

steering/site_media/js/calendar/demos/php/get-timezones.php

steering/site_media/js/calendar/demos/php/utils.php

steering/site_media/js/calendar/demos/selectable.html

steering/site_media/js/calendar/demos/theme.html