new startpage/sidebar: refactoring from clip to sidebar, sidebar is now scrollable, re #4525

git-svn-id: svn://develop.studip.de/studip/trunk@31474 c5b85792-5220-0410-ad23-ed5b6b8ad999
new startpage/sidebar: refactoring from clip to sidebar, sidebar is now scrollable, re #4525

git-svn-id: svn://develop.studip.de/studip/trunk@31475 c5b85792-5220-0410-ad23-ed5b6b8ad999