Offline mode is not working in electron

Having service workers on electron is not as straightforward as in a browser environment.
Therefore, additional code is required to:

1. modularize the workers loading so that each instance can choose how to load the workers
2. the electron worker loader use the correct adapter to make it work on electron (see resources below)

Useful resources:

• https://medium.com/swlh/how-to-run-background-worker-processes-in-an-electron-app-e0dc310a93cc
• https://github.com/mikehall314/electron-comlink