Many update to quiz page

-Removed some dead code on aviation.
-Added prev/next  buttons to quiz page(these may need to be changed in
the future).
-Introduced a possible audio icon.
-introduced a possible clicked audio icon,
-tied them together so when one is clicked the others the default icon.
-Attached audio to the buttons.

----need to figure out how to randomize the audio button order and quiz
card order.