Add BlueHand Keyboard again

[DonPavlov]

Board/Shield Check-list

• [X ] This board/shield is tested working on real hardware
• [X] Definitions follow the general style of other shields/boards upstream (Reference)
• [X] .zmk.yml metadata file added
• [X] Proper Copyright + License headers added to applicable files (Generally, we stick to "The ZMK Contributors" for copyrights to help avoid churn when files get edited)
• [X] General consistent formatting of DeviceTree files
• [X] Keymaps do not use deprecated key defines (Check using the upgrader tool)
• [X] &pro_micro used in favor of &pro_micro_d/a if applicable
• [X] If split, no name added for the right/peripheral half
• [X] Kconfig.defconfig file correctly wraps all configuration in conditional on the shield symbol
• [X] .conf file has optional extra features commented out
• [X] Keyboard/PCB is part of a shipped group buy or is generally available in stock to purchase (OSH/personal projects without general availability should create a zmk-config repo instead)