[docs] Manual setup doesn't work with Expo 54

[Henrique-Gomes]

Hello!

The instructions for installation with Expo doesn't work with the latest version of Expo.

The first problem is a minor. With the introduction of Expo Router, the App.js file mentioned in step 6 doesn't exist anymore. The new entrypoint is app/_layout.tsx. But that's fine.

The second problem is harder to solve. After concluding the execution of the indicated steps, we get the following error:

Android Bundling failed 815ms node_modules\expo-router\entry.js (1 module)
 ERROR  node_modules\expo-router\entry.js: [BABEL] C:\Users\MyUser\Desktop\Projects\MyProject\node_modules\expo-router\entry.js: .plugins is not a valid Plugin property