This is a high risk change: every byte the card ships is emitted by a
different bundler, minified by a different minifier, and every
stylesheet is compiled by a different sass. The intent is that the
card's behaviour is unchanged.
**Significant development win**: Build time drops from 24s to 1.1s 🎉
Also adds a test suite ('dist') that runs against the built bundle.
Dermot Duffy