handwired/pilcrow Refactor, Configurator support and readme update (#4602)

handwired/pilcrow Refactor, Configurator support and readme update (#4602)

* handwired/pilcrow: refactor

- layout macro renamed from KEYMAP to LAYOUT
- keymap now uses #include QMK_KEYBOARD_H
- layers reformatted for readability
- removed unused and deprecated fn_actions and action_get_macro blocks
- keymap config.h
  - updated to use #pragma once
  - removed redundant config.h include

* handwired/pilcrow: Configurator support

* handwired/pilcrow: readme update

Updated readme.md file to use modern template formatting.