Add hardware link to index.md

Author: Woyta64

1209/5750/index.md

@@ -5,5 +5,6 @@ owner: Woyta
 license: MIT
 site: https://launcher.woyta.dev
 source: https://github.com/Woyta64/woyta-pad-firmware
+hardware: https://github.com/Woyta64/woyta-pad-hardware
 ---
 An open-source customisable RP2040-based firmware for keyboards/macro pads