Upgrade the React Native generator to use React Native Web

[dunglas]

Description

I would like to upgrade the React Native generator to use Next + Expo or Next + React Native Web.

The we could

• use Next also for the native app generator
• share most of the code between the web and the native Next generators, as we've done in the past for the react and the react native generator
• remove the React generators that aren't using Next

[alanpoulain]

Personally, I think it would be beneficial to keep the React generator.
Not everyone is using or want to use Next.js. It uses React Router, which is the foundation of Remix. Eventually it could share code with a Remix generator.