Alu84 Refactor (#13760)

* info.json: human-friendly formatting

* use QMK 3-character notation for layout macro/data

* alu84.h: use #pragma once include guard

* clean up alu84.c

Remove unnecessary includes and functions.

* refactor config.h

- use #pragma once include guard
- enable Backlight Breathing
- align comments to QMK AVR template

* refactor default keymap

- add license header
- use layer_names enum
- refactor keymap to be more generic
- remove unnecessary and empty functions

* refactor turbomech keymap.c

- edit license header
- refactor keymap for readability (use QMK-native keycode aliases)
- remove unnecessary and empty functions

* refactor turbomech config.h

- use #pragma once include guard
- align to QMK template

* refactor turbomech rules.mk

Edit the file to make it conform to QMK template.

* align rules.mk to QMK template

* touch-up default keymap

* touch-up alu84.h

* rename LAYOUT to LAYOUT_75_ansi

Also enables Community Layout Support

* modernize readme.md

- update description
- convert keyboard data to list
- add flashing and bootloader instructions
- update Docs links

* alias LAYOUT to LAYOUT_75_ansi

* change readme image URL per fauxpark

* touch up turbomech keymap rules.mk per fauxpark

* rules.mk: convert tab to spaces

keyboards/alu84/alu84.c

@@ -14,33 +14,4 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-
 #include "alu84.h"
-#include "rgblight.h"
-#include "action_layer.h"
-#include "quantum.h"
-#include "action.h"
-
-
-void matrix_scan_kb(void) {
-	// put your looping keyboard code here
-	// runs every cycle (a lot)
-
-	matrix_scan_user();
-}
-
-bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
-	// put your per-action keyboard code here
-	// runs for every action, just before processing by the firmware
-
-	return process_record_user(keycode, record);
-}
-
-void led_set_kb(uint8_t usb_led) {
-	// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
-
-	led_set_user(usb_led);
-}
-
-
-