This is to demonstrate having something like a 'Coordinator' that
handles the routing logic of the feature.
It is done as a seperate commit to compare against the original
implementation that has the routing logic encoded explicitely in
each view.
This adds screens to represent a basic "Send" Feature. The main
purpose of this is two-fold.
1. To act as a placeholder for the actual journet
2. To demonstrate a slightly different navigation paradigm, i.e,
a `NavigationView` with >1 depth.