Add a 'Completed' Screen to Player Setup Web-App

[sameleff]

Currently, when the user clicks finish after completing a new player setup via the web-app, there is no feedback in terms of what to do next.

Suggest to add a final screen to the web-app such that:

• User clicks finish, which triggers the Pi to reboot, and takes the user to the "Complete" screen
• "Complete" screen says something along the lines of Setup complete. System rebooting, please wait 1-2 minutes before starting audera. You may now exit setup.