Split output files

[Swiip]

I made a first very naive version of optimization task for Webpack. It bundles everything inside index-[hash].js including vendors even styles.

It's enough at this point but we should (and it's possible) split output files.

• For vendors: https://webpack.github.io/docs/code-splitting.html
• For styles: https://webpack.github.io/docs/stylesheets.html

[zckrs]

Maybe use the conf defined by Angular.io