* Move non-reset SCSS to a new file
* Split shared files and “meta” files into two folders
This also creates two new base scss files for the different app vs embedded CSS files
* Move notice & embed-specific css out of reset
* Update README with folder structure notes
* Add CSS naming conventions following Gutenberg’s standards
* Update `woo-dashboard` to `woocommerce-layout`
* Update admin notice container to new classname standard