Revisit production builds

[RafaelVidaurre]

A sort of hacky fix (Setting NODE_ENV to development on build time) had to be put in place to allow production builds to work. This was merged in #45

This issue is for taking the time to look into this as a team and figure out how to deal properly with this issue.

[Grsmto]

Would be a good idea to check at CRA as they are releasing v2 with Webpack4 + Babel7 support so our solution is probably there. Also they are dropping support for monorepo (bit scary for us) but I'm not sure what this means but worth having a look:
https://gist.github.com/gaearon/8650d1c70e436e5eff01f396dffc4114#monorepo-support-from-2x-alphas-was-removed-in-final-20

[RafaelVidaurre]

Definitely worth looking at!