Improve URL scheme

[sethwoodworth]

In addition to slugs on School, Course, can we organize urls like so:

/<school-slug>/<course-slug>/

This will remove the ABSURD long urls to course pages.

Then route via this instead of Course.title

[sethwoodworth]

Changed to b/{{school-slug}}/{{course-slug}}. Still need to setup the notes IDs for this

[sethwoodworth]

Updated for files