big commit with lots of changes
remove unused promo stuff
move db change into its own migration
remove amount value from hidden input field

retrieve amount from db in controller
modified view/controller to show dolalr value if total due is not paid and wrote paid if paid.
change amount due into a one-line ternary operator
rollback on reservation:paid, altered code and ran migration to add paid column to reservations as int

modified code to be boolean on controller and view
remove extra helper files
removed def "new" from charges controller
remove charges controller
test reservations