add product route, separate layouts between home & pages

app/(page)/layout.js

@@ -0,0 +1,12 @@
+export default function ProductLayout({ children }) {
+    return (
+        <>
+            {/* <header> */}
+            {/*     <nav> */}
+            {/*         <a>back</a> */}
+            {/*     </nav> */}
+            {/* </header> */}
+            <main>{children}</main>
+        </>
+    );
+}