chore: add title and description to individual pages (#847)

Add Title and Description to Individual Pages.
eg:- Security | Documenso, Profile | Documenso etc.

apps/marketing/src/app/(marketing)/singleplayer/page.tsx

@@ -1,5 +1,11 @@
+import type { Metadata } from 'next';
+
 import { SinglePlayerClient } from './client';
 
+export const metadata: Metadata = {
+  title: 'Singleplayer',
+};
+
 export const revalidate = 0;
 
 // !: This entire file is a hack to get around failed prerendering of