Update template with new features

[OlegWock]

This template is still works well for me, but there were couple of neat features I added to particular project configs which I'd like to backport here:

• Ditch prettier
• Remove fixed list of chunks (ui and others) and let Webpack decide which chunks will be optimal
• Create custom setup/plugin so webpack will be able to automatically load them. This should take into account current context
  • Extension page (incl. popup)
  • Background page
  • Background worker
  • Content script
• This should allow us to utilize dynamic/lazy import too
• Include library/utility for type-safe messaging

[OlegWock]

Might be useful to detect current context

https://github.com/fregante/webext-detect-page