Fix the slide behaviour when the controls are closing (wulkano#149)

* Fix the slide behaviour when the controls are closing

* Remove console.log

* Remove setTimeout approach

and replace with ipcRenderer.sendSync to take the finish of the transition syncronously, combined with a callback to add "hidden" class to "controls-content" div

v1.0.0 🚢

@skllcrn doesn't like emojis 😢

Shift + ⬆️ / ⬇️ == 10x the value ✨

Add `Contribute` section [skip ci]