Add pagination to Instructor Directory

[trevordmiller]

When pagination was added to the InstructorDirectory it broke the client (only showing the first page of instructors now); pagination support needs to be added to the client to show all pages of instructors.

• [x] Fix lesson pagination
• [x] Add pointer to pagination buttons
• [x] Add instructor pagination
• [x] Show sort query param?
• [x] Show loading on pagination change
• [ ] Update IC