Finding a way to add back service workers without causing browser compatibility issues

[carlvlewis]

In a recent PR, @cweems fixed the issue affecting Android browsers and Firefox by removing the file sw.js which holds the service workers that prevent the app from loading fresh each time and cut down on latency a good deal.

I'm not sure what part of the service workers were causing the incompatibility or if it has always been incompatible. But it would be helpful for us to look into so that we can improve the performance.