Easier access to mobile dev locally

Granted, it's easy these days to open dev tools and select responsive design to test CSS, but we all know that 90% of the time when you load your site up on an actual mobile device, the browsers don't behave the same.

To make this easier on people, when you run lucky dev locally, we should print a giant QR code to the terminal that you can point your phone camera at to load up your site locally. This would just generate a local URL like http://192.123.1.1:3000 or whatever. The mobile dev framework Expo has something like this, except theirs does expo://.