Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/50939
Redesigns React Native's `NewAppScreen` component, and moves it into a new `react-native/new-app-screen` package with a single component export. Deletes the old New App Screen under `'react-native/Libraries/NewAppScreen/'`.
{F1977434404}
**Motivation**
- **Reduces our public API** (see https://github.com/react-native-community/discussions-and-proposals/pull/894)
- Separates this screen from the main `react-native` package, where it was a number of subpath exports.
- Reduces the size of the main `react-native` package, including image assets — which are redundant for consumers like Expo.
- **Updated visual treatment**
- Replace outdated logo, update to a responsive tablet/windowed layout.
- Removes outdated guidance (e.g. "use cmd+R to reload"), and generally simplifies the layout (with the aim of reducing future maintenance).
- **Simplifies template boilerplate**
- `NewAppScreen` is now a fully encapsulated screen layout, avoiding the cruft of the previous modular design.
**Integration plan**
When we cut the `0.80-stable` branch, we'll update [the template](https://github.com/react-native-community/template/blob/main/template/App.tsx) to import and use `<NewAppScreen />`.
- This will cause an extra runtime dependency in the template `package.json`, which will require user cleanup. We are happy with this tradeoff, given the self-evident package name, reduction of template boilerplate, and size reduction on the main `react-native` package.
Changelog:
[General][Breaking] - The `NewAppScreen` component is redesigned and moved to the `react-native/new-app-screen` package
Reviewed By: cipolleschi
Differential Revision: D73657878
fbshipit-source-id: 9ca07afa9fbdd6f32015eafa2f27d52ed182918e
