* Align codebase with documentation.
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.
* Update existing boards/shields for new `steps` and `triggers-per-rotation` set up.
Co-authored-by: Pete Johanson <peter@peterjohanson.com>