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/js-client/page.mdx

@@ -6,6 +6,12 @@ export const metadata = {
 
 # {metadata.title}
 
+<Note type="soon">
+
+Medusa JS Client doesn't support Medusa v2 yet.
+
+</Note>
+
 The [Medusa JS Client](https://www.npmjs.com/package/@medusajs/medusa-js) provides easy access to the Medusa application's REST APIs within TypeScript or JavaScript frontend projects.
 
 For example, if you're creating a storefront with frameworks like Nuxt, you can send requests to the Medusa application using this client.