Make the current hunt page just before the hunt is released friendlier

[dlareau]

Currently on the day of the hunt before the hunt is released, the hunt page just sort of says "Not Available" and looks kinda error-ish. Just do a quick re-design so that it looks more friendly and conveys that the hunt hasn't started yet but will soon.

[timparenti]

Similarly, just after the hunt ended, "previous hunt" seemed similarly abrupt; meanwhile, the navigation bar still uses the phrasing "current hunt" for the time being. Perhaps "latest hunt" is better wording throughout after a hunt has ended but before the next/upcoming one has been loaded into the application.