Add DELETE /family/{id}/user/{user_id} route

geneit_backend/src/main.rs

@@ -118,6 +118,10 @@ async fn main() -> std::io::Result<()> {
                 "/family/{id}/user/{user_id}",
                 web::patch().to(families_controller::update_membership),
             )
+            .route(
+                "/family/{id}/user/{user_id}",
+                web::delete().to(families_controller::delete_membership),
+            )
     })
     .bind(AppConfig::get().listen_address.as_str())?
     .run()