Update iOS config

[damian-molinski]

Summary

Bring back iOS config up to date with latests standards

Description

Each of sub points may be separate ticket.

Subtasks

• Bump min system version to 16
• Remove Voices from app name
• Update BUNDLE_IDENTIFIER's to io.catalyst.app
• Update app icon to match web. Each flavour should have badge (expect for prod) Use https://icon.kitchen/
• Update splash screen using flutter_native_splash (just icon, no animation needed now)
• Update Signing & Capabilities with manual or automatic signing (ask @minikin for AppStore access)