Flutter - Create an empty profile page

[klyngen]

We currently have a navigation-bar in the app. However it does not do anything. Using the defined patterns in the flutter app, do the following

• [ ] Create a new widget, representing a profile page
• [ ] When clicking the various elements in the navigation bar, the user should be routed to the new element
• [ ] The app should not render a back-button after navigating. Hint: Navigator.pushReplacement(context, route);

[rsletta]

@klyngen -> https://github.com/Alv-no/alvtime/pull/835