improve: mini css extract plugin config (? maybe useless)

webpack.prod.js

@@ -25,7 +25,8 @@ module.exports = merge(common, {
     }),
     new MiniCssExtractPlugin({
       filename: '[name].[contenthash:8].css',
-      allChunks: true,
+      chunkFilename: '[id].[contenthash:8].css',
+      // allChunks: true,
     }),
     new BundleAnalyzerPlugin(),
   ],