Renamed (app) folder to (main).

src/app/(main)/layout.tsx

@@ -0,0 +1,19 @@
+import Shell from './Shell';
+import NavBar from './NavBar';
+import Page from 'components/layout/Page';
+import styles from './layout.module.css';
+
+export default function AppLayout({ children }) {
+  return (
+    <Shell>
+      <main className={styles.layout}>
+        <nav className={styles.nav}>
+          <NavBar />
+        </nav>
+        <section className={styles.body}>
+          <Page>{children}</Page>
+        </section>
+      </main>
+    </Shell>
+  );
+}