Add Silent mode

[BlyadinaNoname]

I think there is a possibility to add the so-called "Silent Mode". It will allow you to use the gadget without the sound of turning it on, pressing buttons, etc.

[Noah Axon]

I think we complely disabled the music at boot on all platforms. That leaves NEMO Portal making a small beep when someone enters a password as the only remaining source of speaker noise. I think we can make a toggle for that. Are you suggesting that the button clicks themselves are also too loud? How do you propose we fix that, if so?