Use electron-builder for packaging

[anderejd]

It seems to be the most mature and widely used option for packaging electron, based on github statistics.

https://github.com/electron-userland/electron-builder

[Boscop]

@anderejd Yes, please add an example way of packaging this into a standalone executable :)
I'm not sure what the best packager is, but electron-forge uses electron-packager under the hood..

[anderejd]

If anyone wants to bite into this and send a PR that would be most welcome. This is just a small experiment on my part and the first time I tried using Electron for anything.