feat: initial commit.

routes/_app.tsx

@@ -0,0 +1,18 @@
+import Header from "../components/Header.tsx";
+import { define } from "../utils.ts";
+
+export default define.page(function App({ Component }) {
+  return (
+    <html data-theme="light">
+      <head>
+        <meta charset="utf-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>Deno Fresh Dummy</title>
+      </head>
+      <body>
+        <Header />
+        <Component />
+      </body>
+    </html>
+  );
+});