* Add CSS naming conventions following Gutenberg’s standards
* Update `woo-dashboard` to `woocommerce-layout`
* Update admin notice container to new classname standard
* Add an ActivityCard component
* Add font-size mixin, hover-state mixin, and a fake base padding
* Style the ActivityCard
* Style the card image
* Add README
* Address PR feedback
- Add className prop
- children propType is required
- Link to a real image