Update Feliz.Router to latest

[Zaid-Ajaj]

Feliz.Router had a major upgrade with breaking API changes. Update the relevant book parts based on the new API

[Samuel-Dufour]

It looks like my PR is related to this issue.

[chiavennasca]

BTW, I opened Zaid-Ajaj/elmish-routing#1 to update the linked sample application to the latest version.

[Zaid-Ajaj]

Thanks a lot for the updates @chiavennasca 🙇 really appreciate it!