core: frontend: vehicle-setup: failsafes: cover status LED and buzzer

### Current behaviour

The page only covers configuration options to set up failsafes, including selecting their flight mode / motion behaviours, which misses out on describing other behaviours the flight controller board will exhibit. This can make those behaviours unexpected, and difficult to debug.

### Expected or desired behaviour

1. Cover [status LED patterns](https://ardupilot.org/sub/docs/common-leds-pixhawk.html) and [buzzer sounds](https://ardupilot.org/copter/docs/common-sounds-pixhawkpx4.html#common-sounds-pixhawkpx4) in the failsafes page (or at least link to an explanation of them)
2. Potentially create a help/troubleshooting page to work through common issues, ideally with some kind of button-driven flowchart to efficiently walk through options
- This could include questions around the status LED and buzzer, amongst other connectivity states and visual cues
- This could also be made available through our documentation / on the BR website

### Context

Missing information was raised in [this forum comment](https://discuss.bluerobotics.com/t/psm-power-sense-module-voltage-alarm/20486/6).

### Prerequisites

- [x] I have checked to make sure that a similar request has not already been filed or fixed.