• Revise the text on the buttons on the navigation page to match the design (screenshot below).
• Revise the colors on each button as needed to match the design.
• Revise the sorting order for items within each category to match the design.
• Implement progress bar option for the buttons.
• Grab the necessary data for the progress bars.
• Improve the logic / organization / code structure of the code on this page. Break into helper functions / revise variable names, etc.

Note: for TA grading progress bar, this should be the fraction of your assigned grading that is complete. If you are an instructor user and not assigned to any students, this should be the fraction of all TA grading that is complete.

Note: This screenshot might be stale. The current design is stored in a private Google doc.

Replaces issues #674 and #475

Related to / will also close issue #557....