need better communication to screen readers

[argyleink]

should say that it's arrow navigation and not tabs, since we kinda are hijacking it into something other than what is natural

[hchiam]

using arrow keys to select different items in the list makes me think of radio input interaction, so then maybe something like adding role="radio" to each item would be a quick clean fix, at least for now?

this would help enhance things like the game menu where each item is a button, since it otherwise may not be immediately obvious to users that you must use the arrow keys and can't tab to the other buttons in the same list

[hchiam]

see discussion #23 (comment)