Removed "label" properties which no longer have any function. Labels are still used as layer names and as identifiers for sending behaviors between sides of a split keyboard, so those have been left alone for now.
Standardized indentation to use spaces with a new pre-commit hook.
* Workaround Zephyr bug for Nordic SPI(M) driver after the pinctrl refactor by using spi3 peripheral for the SPI bus for the WS2812 led_strip driver.
