refs #3218: rearrange graphics in directories, delete useless files

git-svn-id: svn://develop.studip.de/studip/trunk@25273 c5b85792-5220-0410-ad23-ed5b6b8ad999
refs #3218: blubber to online-users

git-svn-id: svn://develop.studip.de/studip/trunk@25274 c5b85792-5220-0410-ad23-ed5b6b8ad999