Updates card list when dragged to new list. Fixes render issue with dragged lists. Fixes card description update focus issue.  Re-renders page upon modal close to capture new card description. Fixes issue of modal render when due date submitted with same value (syncs with server instead of 'changes')
Moves description field in card modal to separate div so that x persists even when editing description field.
Adds nav bar to login/signup pages.
Styles card modal. Changes main font type.