Add a new npm dependency

Author: cfinnberg

docs/documentation/customize/with-webpack.html

@@ -14,6 +14,7 @@
 npm install bulma --save-dev
 npm install css-loader --save-dev
 npm install extract-text-webpack-plugin@next --save-dev
+npm install mini-css-extract-plugin --save-dev
 npm install node-sass --save-dev
 npm install sass-loader --save-dev
 npm install style-loader --save-dev