chore(website): start with fresh template for preact

apps/website3/src/components/Header.tsx

@@ -0,0 +1,18 @@
+import { useLocation } from 'preact-iso';
+
+export function Header() {
+	const { url } = useLocation();
+
+	return (
+		<header>
+			<nav>
+				<a href="/" class={url == '/' && 'active'}>
+					Home
+				</a>
+				<a href="/404" class={url == '/404' && 'active'}>
+					404
+				</a>
+			</nav>
+		</header>
+	);
+}