Deep linking example

**Describe the example you'd like**

A simple example to utilize [deep linking](https://docs.expo.io/versions/latest/workflow/linking) (maybe with React Navigation and _if possible_ something like [Firebase Dynamic Links](https://firebase.google.com/docs/dynamic-links)?)

There was a question on Slack about this with some key subjects:
- issues with initially loading the app from external sources (using a scheme)
- not sure how this is supposed to work with Chrome on Android
- primary use case is using text messages with the link (only the part after the scheme was clickable)
- using a webpage as fallback for older phones might be also a good demonstration (also solves app not being installed on android/ios)

~~**Any existing examples?**~~