Add META tags to support safari webapp

[Constaline]

Add these META tags in page's HEAD tag to support safari webapp

<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-title" content="ChatKit">
<meta name="apple-mobile-web-app-status-bar-style" content="default">

[egoist]

I can use chatkit.app as safari web app without these tags 🤔

[Constaline]

It is using for iOS devices 😂

[egoist]

You can already "Add to home screen" on iOS safari without these tags