delete method
Delete a AppBarModel from the repository, cached
Implementation
@override
Future<void> delete(AppBarModel value) {
  fullCache.remove(value.documentID);
  reference.delete(value);
  return Future.value();
}Delete a AppBarModel from the repository, cached
@override
Future<void> delete(AppBarModel value) {
  fullCache.remove(value.documentID);
  reference.delete(value);
  return Future.value();
}