Updated page titles.

src/app/(main)/layout.tsx

@@ -1,3 +1,4 @@
+import { Metadata } from 'next';
 import App from './App';
 import NavBar from './NavBar';
 import Page from 'components/layout/Page';
@@ -17,3 +18,10 @@ export default function ({ children }) {
     </App>
   );
 }
+
+export const metadata: Metadata = {
+  title: {
+    template: '%s | Umami',
+    default: 'Umami',
+  },
+};