docs: add Node.js >=18 requirement and nvm instructions for docs/ folder & format the readme (RocketChat#1007)

Author: Khizarshah01

packages/docs/README.md

@@ -1,25 +1,37 @@
 # EmbeddedChat Documentation
 
-This is the official documentation website of EmbeddedChat
+This is the official documentation website of EmbeddedChat.
+
+> **Node.js Version Requirement**
+>
+> The `docs/` folder requires **Node.js v18 or higher** to run correctly.
+> If you’re using a lower version (e.g., v16.19.0 from other parts of the monorepo), you may encounter errors.
+>
+> Use [NVM](https://github.com/nvm-sh/nvm) to install and switch to the correct version:
+>
+> ```bash
+> nvm install 18
+> nvm use 18
+> ```
 
 ### Installation
 
 ```
-$ yarn install
+ yarn install
 ```
 
 ### Local Development
 
 ```
-$ yarn dev
+ yarn dev
 ```
 
 This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
 
 ### Build
 
 ```
-$ yarn build
+ yarn build
 ```
 
 This command generates static content into the `build` directory and can be served using any static contents hosting service.