Since Zephyr upstream v3.7.0 and some new commands enabled by default,
all systems with an Atmel SAMD21 SoC cause a RAM overflow. Following
unsupported features were disabled for such boards: counter, eeprom,
regulator, rtc, sensor. On the other hand, the command for GPIO LEDs
has been reactivated.

Signed-off-by: Stephan Linz <linz@li-pro.net>

Update all output messages through documentation.

Signed-off-by: Stephan Linz <linz@li-pro.net>

- Application development (extended)

  - Board support
  - Build and configuration system

- Development model (extended)

  - Managing the code base

Signed-off-by: Stephan Linz <linz@li-pro.net>

Add more supported or respected boards:

- NXP MIMXRT1170-EVK/EVKB (CM7)
- Nordic nRF52840 DK
- Nordic nRF9160 DK
- ST Nucleo F4xxxx
- ST Nucleo F7xxxx

Signed-off-by: Stephan Linz <linz@li-pro.net>