Improve splash screen

[josuah]

The Monocle comes bare-bones. To be able to have a quick impression of its abilities, as well as allow to use it without any programming, a demo app could provide a set of core features.

Some examples from the chat:
https://discord.com/channels/963222352534048818/1100115561997934633/1100118956091654225

• Image transfer from the camera to the Bluetooth central (output)
• Show notifications from the Destkop (input)

The features from earlier firmware:

• Start continuous recording and offer to show a replay (eventually save it / transfer it?) of the camera feed
• Zoom the camera output.

[siliconwitch]

I can try come up with something for this