Cache editor offline using service worker

[SheepTester]

Should there be a URL option for this?

How can it get the list of URLs? I guess we can use React's CRA

[SheepTester]

Note that this might be a very bad idea if the service worker caches too aggressively, preventing new updates. Ensure that there's a debug panel somewhere where the service worker can be violently disposed of if needed. Use UGWA's control centre, perhaps