[6.0] add react native web to the example app

[dannyhw]

As part of the work by @oblador to remove no-hoisting we removed some of the example projects to slim down the project. This meant removing the expo example which had a web example.

We should add react-native-web to the example app and get something basic rendering.

There may be some changes needed in the project to make this work. Making this work with ondevice knobs will require #120 to be fixed so that should be considered out of the scope of this issue

[dannyhw]

Try https://aureliomerenda.medium.com/create-a-native-web-app-with-react-native-web-419acac86b82

If that doesn't work either change the example project to an expo one or you can try doing a more involved setup with custom webpack config.

Here is a guide with more custom webpack stuff that might be useful also (not tested this)
https://levelup.gitconnected.com/react-native-typescript-and-react-native-web-an-arduous-but-rewarding-journey-8f46090ca56b