Summary:
This replaces the "new app screen" in the template with the new design from https://github.com/react-native-community/discussions-and-proposals/issues/122
This uses components that are shipped as part of the `react-native` module, but not necessarily as proper components exported by the main `react-native` module. To use these, we use absolute imports to those components.
Related to #24760
[General] [Changed] - Updated new app template design 💖
Pull Request resolved: https://github.com/facebook/react-native/pull/24805
Differential Revision: D15334459
Pulled By: cpojer
fbshipit-source-id: d0b67d08f936eeabd9e93d4e0ff78302b4d6429f
Eli Perkins