added logout functionality

src/lib/session.js

@@ -12,6 +12,11 @@ export function redirectToLogin() {
     window.location.href = `/login?returnUrl=${currentPath}`;
 }
 
+export function resetSession() {
+    document.cookie = `sessionKey=; path=/; max-age=0`;
+    window.location.href = '/login';
+}
+
 export function ensureAuthenticated() {
     if (!getSessionKey()) {
         redirectToLogin();

src/routes/Header.svelte

@@ -29,6 +29,9 @@
 				<li aria-current={page.url.pathname === '/about' ? 'page' : undefined}>
 					<a href="/about">About</a>
 				</li>
+				<li aria-current={page.url.pathname === '/logout' ? 'page' : undefined}>
+					<a href="/logout">Logout</a>
+				</li>
 				{/if}
 		</ul>
 		<svg viewBox="0 0 2 3" aria-hidden="true">

src/routes/logout/+page.svelte

@@ -0,0 +1,12 @@
+<script>
+    import { goto } from '$app/navigation';
+    import { resetSession } from '$lib/session.js';
+
+    resetSession();
+    goto('/login');
+</script>
+
+<div>
+    <h1>Logging out...</h1>
+    <p>Redirecting to the login page...</p>
+</div>