Step 1: Make sure you have iOS 13 or higher. You'll need to use the Shortcuts app to make your apps look the way you want, which is only available on iOS 13 or later. If you want to go the full ...

After entering the URL you want to open from the home screen, you’ll be asked to search the App Store for the app artwork you wish to use as the icon. This is all done within Shortcuts and it’s a ...

However, the icon Safari currently suggests for Twitch is their old logo, which I don’t think looks as good as the new one. But I was able to fix this using Federico’s “Save App Store Icon” shortcut.