2-panel redesign

--public

• Redesigned the page to consist of only two panels, which are always visible.
• Saved courses are now viewable via the tab selector in the left panel.
• Cool animations when saving and unsaving courses!
• Filters are now hideable.

--end_public

Addresses #166 (closed), #165 (closed), and #187 (closed)

Also removed some unused files and dependencies.