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

keyboards/crawlpad/config.h

@@ -1,5 +1,4 @@
-#ifndef CONFIG_H
-#define CONFIG_H
+#pragma once
 
 #include "config_common.h"
 
@@ -46,4 +45,3 @@
 #define RGBLED_NUM 3
 #endif
 
-#endif