Update README.md

Author: syucream

README.md

@@ -44,12 +44,8 @@ npm install lightdash-mcp-server
 
 ### Configuration
 
-Create a `.env` file with your Lightdash API credentials:
-
-```env
-LIGHTDASH_API_KEY=your_api_key
-LIGHTDASH_API_URL=https://app.lightdash.cloud  # or your custom Lightdash instance URL
-```
+- `LIGHTDASH_API_KEY`: Your Lightdash PAT
+- `LIGHTDASH_API_URL`: The API base URL
 
 ### Usage