feat: add supervisor role

src/Repository/BookingSeriesRepository.php

@@ -30,9 +30,9 @@ class BookingSeriesRepository extends ServiceEntityRepository
 
     /**
      * Every series still running on the given day, optionally narrowed to one person or one kind
-     * of resource. The admin list is the caller that needs it across everybody.
+     * of resource. The overview at /manage/bookings is the caller that needs it across everybody.
      *
-     * The user is eager-selected because the admin list names the holder of every row -- without
+     * The user is eager-selected because the overview names the holder of every row -- without
      * it the page fires a query per series.
      *
      * @return list<BookingSeries>