CLC-958 - My groups/classes - fix the mobile view
https://jira.media.berkeley.edu/jira/browse/CLC-958

Also fixes:
 - Remove unnecessary items in footer
 - Footer - make links more clickable
 - Remove border in mobile view for the tasks
Merge pull request #469 from christianv/CLC-958

CLC-958 - My groups/classes - fix the mobile view