Offline

[ethanaobrien]

See https://github.com/ethanaobrien/worker-server for an example

Use service worker to cache urls and serve when offline

I think we should have a basic offline page and I also think the demo page should be cached, along with the files in the data directory (not the emulator core files, the emulator has its own caching for that)

@allancoding what do you think? Would you like to do this or do you want me to?

[allancoding]

That's a good idea. You can do it. because I think you already did.😐