docs: added node.js required version for next.js storefront (#3758)

* docs: added node.js required version for next.js storefront

* changed required version of node across docs

* small fix

docs/content/starters/nextjs-medusa-starter.mdx

@@ -41,6 +41,14 @@ Instead of manually following this guide to install then later deploy the Next.j
 
 This document assumes you already have a Medusa backend installed. If you don’t, please follow the [Quickstart guide for the Medusa backend](../development/backend/install.mdx) to learn how to do it.
 
+You should also have Node.js with v16 or greater installed. You can check your Node.js version with the following command:
+
+```bash noReport
+node -v
+```
+
+You can install Node from the [official website](https://nodejs.org/en/).
+
 ---
 
 ## Installation