docs(website): fix local development instructions (#1778)

Author: rmarting

website/README.md

@@ -11,11 +11,13 @@ yarn
 ### Local Development
 
 ```shell
-yarn copyDocs
+yarn start
 ```
 
 This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
 
+**NOTE:** Requires Node.js >=16.14.
+
 ### Build
 
 ```shell