save username in cookie

Lab01/app/templates/login.tmpl

@@ -16,12 +16,15 @@
 </div>
 
 {{template "scripts" .}}
+{{template "formScripts" .}}
 <script>
+    userLoggedIn().then((loggedIn) => loggedIn && redirect("/"));
+
     async function submitForm(formData) {
         const response = await fetch("/login", {method: 'POST', body: formData, redirect: 'follow'});
         if (response.ok) {
             const json = await response.json();
-            console.log("JSON:", json.message);
+            setCookie("username", json.username, 1);
             redirect("/");
         } else {
             redirect("/login");