Remove AR Code In MAPI

[JamieB-gu]

Remove all code in MAPI relating to AR, to prevent MAPI sending any more AR URLs to the apps.

[DanielCliftonGuardian]

https://github.com/guardian/mobile-apps-api/pull/3972 - Remove apps-rendering utilities and configuration

[DanielCliftonGuardian]

https://github.com/guardian/mobile-apps-api/pull/4008 - Remove apps rendering models dependency