Reduce bundle size

[vshjxyz]

we need to make use of webpack tree-shaking and analyze the bundle in order to reduce it in order of magnitudes. Right now it makes it very hard to build and maintain

[wnz99]

As per Slack:

https://dev.to/goenning/how-we-reduced-our-initial-jscss-size-by-67-3ac0

Btw, I will try to upgrade to the new version of react-create-app first.