chore: use correct link for mini-css-extract

Author: evenstensberg

src/content/migrate/3.mdx

@@ -267,7 +267,7 @@ Thus make sure to remove the plugin from your configuration:
 
 ## ExtractTextWebpackPlugin - breaking change
 
-[ExtractTextPlugin](https://github.com/webpack-contrib/extract-text-webpack-plugin) requires version 2 to work with webpack 2.
+[ExtractTextPlugin](https://github.com/webpack/extract-text-webpack-plugin) requires version 2 to work with webpack 2.
 
 `npm install --save-dev extract-text-webpack-plugin`