Webpack and babel to support wide range of browsers

[Anonyymi]

• Use webpack for js bundling
• Use babel for transpile+polyfill
• Target es2015 and old browsers

This results in a nice transpile+polyfill output that converts all modern js features like arrow functions, etc to old js that's supported by old browsers.

Tested on firefox 12.0 on windows 2000 :-)

[Anonyymi]

@denamuumi Do you know anything about webpack? How should postcss be used here? I had to strip it out for now, so catalog is broken on this branch...

[github-actions[bot]]

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