docs: improve create-medusa-app guide structure (#4801)

* docs: improved create-medusa-app structure

* change hash link

www/docs/content/homepage.mdx

@@ -162,15 +162,11 @@ Learn about all the new features and enhancements in Medusa.
 <DocCardList colSize={4} items={[
   {
     type: 'link',
-    href: '/modules/products/serverless-module',
-    label: 'Product Module',
+    href: 'https://docs.medusajs.com/ui',
+    label: 'Medusa UI',
     customProps: {
       icon: Icons['tag-solid'],
-      description: 'Learn about the new product module and how to use it in a serverless setup.',
-      badge: {
-        variant: 'orange',
-        children: 'Beta'
-      }
+      description: 'Check out the Medusa UI package, a React implementation of the Medusa design system.',
     }
   },
   {