Rename select2 theme files
Cleanup Navigation and Controlbar CSS

- Move to more standard BEM syntax
Remove unused phase-container class
Admin MMT css cleanup
[#83896390] Misc UX clean-up

— Styles for file upload preview
[#83889072] Normalize patterns in MI cards
Fix qunit navbar test
Fix question counts
Merge pull request #696 from Tahi-project/css_cleanup_dec_8

CSS Cleanup