Publish packages for Windows and Linux distros

[FlorianHockmann]

Although it's really easy to build Gremlin IDE, it would be great to have packages already available to download to lower the bar for new users.

Maybe something like the electron-builder makes sense to use for this task. It even seems to offer an auto update functionality. But I don't have any experience with building Electron apps, so, there could also be much better / simpler solutions.