Routing

[trbachmann]

• 4 - All requirements from 3 met, and always chooses the correct component for rendering, as well as the correct Route API. Application should account for undefined routes.
• 3 - Application uses React Router to display appropriate components based on URL.
• 2 - Application uses React Router, but does not display the appropriate components upon navigating.
• 1 - Application uses React Router, but does not render/use all routes.