add jaykeeb joker

[alabahuy]

Description

Add jaykeeb joker, 1800 layout for austin

QMK Pull Request

qmk/qmk_firmware#23535

Checklist

• The VIA support for this keyboard is MERGED in QMK 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 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

[Cipulot]

I've gone on and manually forced the correct key color scheme from the one presented here. Please tho.... check that the colors are actually correct and don't simply tick the "I have assigned alpha keys and modifier keys with the correct colors." just to play "tick the box".

[alabahuy]

im sorry for the color scheme, and thank you for merged :)