Changing to new head structure.

src/app/(extra)/book/head.jsx

@@ -1,10 +0,0 @@
-import StandardHead from '@/components/StandardHead';
-
-export default async function Head({ params }) {
-  return (
-    <StandardHead
-      title="Foundations of High-Performance React"
-      description="A book diving deep into the details of how React actually works."
-    />
-  );
-};

src/app/(extra)/book/page.jsx

@@ -24,6 +24,11 @@ const chapters = [
   'Conclusion'
 ];
 
+export const metadata = {
+  title: 'Foundations of High-Performance React',
+  description: 'A book diving deep into the details of how React actually works.'
+};
+
 export default async function Page({ params }) {
   return (
     <>