Add example to config describing how to power off monitors after locking

[Hofer-Julian]

With the current default behavior, Mod + Alt + L opens swaylock, but doesn't power off monitors. The config should include a commented out example showing how to add the power-off after logging out.

[BRS5672023]

Actually I think this might be the desired behavior.. One can add a rule in swayidle so that if swaylock is running, then after some time the screen is turned off. For example, I'm using the following swayidle config:

timeout 900 'pidof swaylock || swaylock -f'
timeout 960 'niri msg action power-off-monitors'
timeout 60 'pidof swaylock && niri msg action power-off-monitors'
before-sleep 'pidof swaylock || swaylock -f'

[YaLTeR]

Oh, that's an interesting way to do it.