UI Fixes:
- Background is fixed positioned and not tiled
- Overflowing of description block is handled
- Alignment of the title and the hello message
- when changing tab in the ILS it doesn't not scroll back up to show the top bar
- Title and greeting message are not links anymore
- The tab bar scrolls up and covers the title bar instead of pushing it away
Merge pull request #123 from react-epfl/ILS_new_design_fixes