docs: remove FAQ page from navigation and delete file

The FAQ page contained outdated troubleshooting information for issues that have been fixed in later versions of Nuxt and Vuetify. Removing it prevents users from following obsolete workarounds.

Author: AndreyYolkin

docs/.vitepress/config.ts

@@ -151,12 +151,6 @@ export default withPwa(defineConfig({
           { text: 'Locale Messages', link: '/guide/advanced/locale-messages' },
         ],
       },
-      {
-        text: 'Help',
-        items: [
-          { text: 'FAQ', link: '/guide/faq' },
-        ],
-      },
     ],
   },
   vite: {