Use react-refresh plugin for live reload

[sublimator]

• Seems to have problems with pnp, hopefully rectified by new yarn release (should report bug)
  • complains about webpack.Compilation instanceof issues
  • 
• Can set linker: node-modules in .yarnrc.yml

Note that would have to set the manifest to load js assets (popus.js/background.js/content.js etc) from the webpack serve localhost urls.

[sublimator]

(Note: does NOT do HMR, but it's still a useful reference) https://github.com/rubenspgcavalcante/webpack-extension-reloader