Can disable couple photos (#5)

Add an option in family settings to disable couple photos from Web UI

Reviewed-on: #5

geneit_backend/src/schema.rs

@@ -25,6 +25,7 @@ diesel::table! {
         time_create -> Int8,
         name -> Varchar,
         invitation_code -> Varchar,
+        disable_couple_photos -> Bool,
     }
 }