Better default scaffolding router implementation

[Vheissu]

This one might have to wait until the rename from @aurelia/router-lite to @aurelia/router is completed. But, currently when the user chooses routing in the CLI, there's nothing configured in the app.

We should have:

• Default registered routes
• Configuration based routing
• Adds in a <au-viewport> element pair to my-app.html
• A routable component so users can see routing work immediately after scaffolding and install

CC @Sayan751

[3cp]

I would like to change the scaffold from direct routing to transitional routing with configuration, I assume that's what most users will use.

[Vheissu]

I would like to change the scaffold from direct routing to transitional routing with configuration, I assume that's what most users will use.

Exactly. That's the goal here to change it from direct routing and make it more conducive to something devs would be accustomed to from other frameworks and libraries, or v1.