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.
* Add new shield for splitkb.com Aurora Sofle, supporting
keys, encoder(s), displays, and RGB.
Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>