Not sure what you mean with launch full-screen, but you can add a shortcut to any website on your home screen using Safari. https://www.wikihow.tech/Add-a-Link-

Not sure what you mean with launch full-screen, but you can add a shortcut to any website on your home screen using Safari. https://www.wikihow.tech/Add-a-Link-Button-to-the-Home-Screen-of-an-iPhone https://www.wikihow.tech/Add-a-Link-Button-to-the-Home-Scree...