update link registration site to executive dashboard

backend/apps/accounts/serializers.py

@@ -12,6 +12,12 @@ class PkAsIdMixin(serializers.Serializer):
     id = serializers.IntegerField(source="pk", read_only=True)
 
 
+class SlugPkAsIdMixin(serializers.Serializer):
+    """JSON `id` for slug / string primary keys."""
+
+    id = serializers.CharField(source="pk", read_only=True)
+
+
 class UserSerializer(PkAsIdMixin, serializers.ModelSerializer):
     class Meta:
         model = User