fix Answer#question method, clear sections after main header, move "/sign_out" block to user routes, move session start to be after the user is found, save & reload user sign_up then add user.id to session params, use catagory in header for question & answer views, fix bug where lack of forward slash in link tags href attributes would have browser send a request for a file in the present route's "directory" resulting in the href being intepreted as a db id