Update initialization procedure to allow motor init to fail and display the persistent message

[eamars]

After the screen and wifi module is initialized, We should allow the motor init to fail, and display a persistent message to the screen (and possibly redirect all wifi messages to ask user to inspect the stepper driver. The Neopixel LED should also be set to all red.
In case the screen is not attached, the Pico W led should blink fast to indicate the failure to initialize the driver.

https://github.com/eamars/OpenTrickler-RP2040-Controller/blob/main/src/app.cpp#L42