[Build] Remove React Native Fork

[Bhullnatik]

We are using a React Native fork to use a custom OkHttpClient that accepts every certificate and/or specific ones to work with some clusters. The feature was removed in facebook/react-native@0a71f48.

It would be way easier to compile/use the Android app if we could remove it using facebook/react-native@22efd95 once it is merged, but that will probably require updating React Native from a few major versions.

[MOZGIII]

It's in since 0.54. What now?