Updates to Question and Course Screen UIs

Includes:
- Adding more styling for filters
- Updating display logic for buttons and instructional text
- Removing unnecessary text/buttons
- Adding pending and completed assignment feedback
- Changing colour of disabled buttons
- Updating Gradebook tab to "Participation"
- Adding more styling to participation tab
- Making all columns in participation table sortable
- Adding more time to timeout for "Read More" buttons
- Changing evaluate/evaluations to compare/comparisons
- Updating labels, placement for filters
- Changing wording for instructor's answer