App Builder

I started using the example app, but I'm having a hard time to get navigation up and running.Is there any example about a simple app with a "header" (top navigation with a few sample entries) and some components (as routes for the header nav?would save me a lot of time to start with a simple templat...

Is it possible to create an app that is available for other organizations after publish? sort of a service that can be used by any organization that is interested in? thanks in advance for any help!