Invoking navigation routes by name

Routing is a concept that is so engrained into the internet that we almost don't think about it anymore.  

In Flutter, you can use named routes. This means you can assign a textual name to your screens and simply invoke them as if you were just going to another page on a website.

In this recipe, you are going to update the existing routing mechanism in the stopwatch project so that you can use named routes instead.