User creation now possible

at /register

frontend/src/pages/ticket.rs

@@ -1,6 +1,5 @@
 use gloo_net::http::Request;
 use serde::{Deserialize, Serialize};
-use serde_json::json;
 use wasm_bindgen::JsCast;
 use wasm_bindgen_futures::spawn_local;
 use web_sys::HtmlSelectElement;