Clarify CSS auto-prefixing in Next.js setup

Author: MoOx

apps/website/docs/learn/environment-setup/02-next.md

@@ -66,19 +66,16 @@ const config = {
       babelConfig: babelLoader,
       useLayers: true,
     },
-    autoprefixer: {},
+    // If your pipeline doesn't already do CSS auto-prefixing, feel free to install as well autoprefixer
+    // $ npm install --dev autoprefixer
+    // and uncomment the line below
+    // autoprefixer: {},
   },
 };
 
 export default config;
 ```
 
-If necessary, run
-
-```
-npm install --dev autoprefixer
-```
-
 ## Next.js configuration
 
 Create or edit the `next.config.js` file as follows. Note that below you will find config for both turbopack or webpack.