remove all bill related stuff

db/enums.ts

@@ -5,18 +5,6 @@ export enum BOOKING_STATUS {
   CANCELED = 'canceled',
 }
 
-export enum BILL_STATUS {
-  UNINVOICED = 'uninvoiced',
-  INVOICED = 'invoiced',
-  PAID = 'paid',
-}
-
-export enum MILAGE_TARIFS {
-  INTERN = 'intern',
-  EXTERN = 'extern',
-  NOCHARGE = 'nocharge',
-}
-
 export enum VALIDATION_ERRORS {
   AT_LEAST_ONE_DAY_BOOKED = 'atLeastOneDayBooked',
 }