Crawlpad refactor (#4854)

Crawlpad refactor (#4854)

* Crawlpad: delete kbfirmware JSON file

* Crawlpad: refactor

- config.h and crawlpad.h updated to use #pragma once method
- layout macro renamed from KEYMAP to LAYOUT_ortho_4x4
- default keymap now uses #include QMK_KEYBOARD_H
- deleted deprecated action_get_macro function
- cleanup rules.mk file
- add LAYOUTS = ortho_4x4 to rules.mk

* Crawlpad: Configurator support

* Crawlpad: readme update

- update image link to direct link
- fully update Docs link line
- delete reference to deleted kbfirmware JSON file