Adding 1u center column layout to Promenade (HS)

[Feags]

Description

The Promenade comes in two layouts: 1.5u center column and 1u center column. It is 1.5u by default. The 1u and 1.5u pcbs are exactly the same, only differentiated by which key locations have hotswap sockets. The original firmware for the Promenade only had the 1.5u center layout. This change adds 1u layout option.

QMK Pull Request

Original Promenade Firmware added
Promenade Layout updated

VIA Keymap Pull Request

the-via/qmk_userspace_via#52

Checklist

• The VIA support for this keyboard is MERGED in QMK master already (MANDATORY)
• VIA keymap is MERGED in VIA userspace master already (MANDATORY)
• The VIA definition follows the guide here: https://caniusevia.com/docs/layouts
• I have a V3 JSON version for this keyboard definition.(MANDATORY)
• I have formatted the JSON file to have consistent formatting with the rest of the repository.
• I have tested this keyboard definition using VIA's "Design" tab.
• I have tested this keyboard definition with firmware on a device.
• I have assigned alpha keys and modifier keys with the correct colors.
• The Vendor ID is not 0xFEED