docs: editing and general fixes of medusa's learning resources (#7261)

* docs: editing and general fixes of medusa's learning resources

* fix build script

* update ui dependency

* fix build

* adjust next.js steps

www/apps/resources/app/deployment/storefront/vercel/page.mdx

@@ -4,6 +4,12 @@ export const metadata = {
 
 # {metadata.title}
 
+<Note type="soon">
+
+The following deployment guide doesn't support Medusa v2 yet.
+
+</Note>
+
 This guide explains how to deploy the Medusa Admin separately from the Medusa application to Vercel.
 
 <Note title="Important">