Answered questions picked for questions of the day

[lucyturn3r]

Sometimes questions that a user has already answered (on another day) show up under their questions for the day on their dashboard. If we are going to show them questions they have already answered after some minimum time limit (e.g. one or two months) then they should not be formatted as a question that has been answered, i.e. there should be no tick in the checkbox and the background should not be highlighted.

It would also be nice if the questions shown for the questions of the day could change over at midnight.