Help feature not catering to CLI-centric users

[jinnhl]

Problem: The help pop-up window can only be accessed via clicks.

Reason: Since the product should be targeting users who can type fast and prefer typing over other means of input, the help feature does not have any type-based command to navigate the help menus can be seen as a feature flaw.

[nus-se-script]

Your response not required for this bug as the team has accepted the bug as it is.