Create Wi-Fi setup error page

[rock3r]

If in the WiFi setup things don't work we should show some error UI:

Please refer to @ScribblyPixels' designs.

The "no thanks" button dismisses the page, "open settings" opens the settings screen where users can manually add the network. The Copy button will copy the password to the clipboard.

⚠️ The existing designs are still WIP

⚠️ Blocked by #48 (implementing the WiFi setup code)