Customize the Splash Screen of a PWA built with create-react-app

Android displays a splash screen for PWAs based on the icons and names you provide, but iOS just displays a solid color splash screen for installed PWAs by default.

We'll make a new splash screen image for every iOS device resolution size that we want to support, and then we can make a link tag in index.html to specify those images as the splash screen for each device resolution.

Also, make sure to remove background_color from the manifest - or it may overwrite the splash screen images on iOS.