Uses class method to get list of instance admins

Re-writing this query over and over is a bad approach

bookwyrm/models/user.py

@@ -231,6 +231,14 @@ class User(OrderedCollectionPageMixin, AbstractUser):
             queryset = queryset.exclude(blocks=viewer)
         return queryset
 
+    @classmethod
+    def admins(cls):
+        """Get a queryset of the admins for this instance"""
+        return cls.objects.filter(
+            models.Q(user_permissions__name__in=["moderate_user", "moderate_post"])
+            | models.Q(is_superuser=True)
+        )
+
     def update_active_date(self):
         """this user is here! they are doing things!"""
         self.last_active_date = timezone.now()