On iOS: tap the share button in browser => add to home screen
On Android: tap the 3 dot menu button in browser => tap "install" or "add to home screen"
Yeah! Kbin PWA is great. (Though there's a very small amount of sidescroll that makes my frontend web dev heart cry a bit... maybe I should open a pull request for it :))
Though it seems to override my screen orientation settings, making it hard to read while lying in bed XD