AG Grid Usage improvements

[JettChenT]

Several aspects of the current table editing experience could be improved

• [x] Shift+Tab to move to the cell above
• [x] Something to click at to lose focus on the current cell
• [ ] A visual indication of the editable values
• [x] Delete course

[JettChenT]

Commit 96d1d2b2863049aee47b808e53df6a0ca9fce3f3 :

• [x] Delete course functionality
• [x] Automatically lose focus on the current cell
• [x] Shift+Tab