Tada68 Fixes and Minor Refactoring (#7820)

* fix ANSI layout macro reference

* update ISO layout macro and enable 65_iso community layout support

- rename to LAYOUT_65_iso (with LAYOUT_iso alias for backwards compatibility)
- rename position k2c to k1d (electrical position)

* rules.mk templating

* tada68.h: use #pragma once include guard

* config.h: use #pragma once include guard

* make product id unique

* update info.json

* update readme

* cleanup default keymap

- keycode alignment
- layout macro reference
- four-space indent

* remove matrix_*_user functions from tada68.h

keyboards/tada68/config.h

@@ -15,14 +15,13 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef CONFIG_H
-#define CONFIG_H
+#pragma once
 
 #include "config_common.h"
 
 /* USB Device descriptor parameter */
 #define VENDOR_ID       0xFEED
-#define PRODUCT_ID      0x6060
+#define PRODUCT_ID      0x4C17
 #define DEVICE_VER      0x0003
 #define MANUFACTURER    TADA
 #define PRODUCT         TADA68
@@ -75,5 +74,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //#define NO_ACTION_ONESHOT
 //#define NO_ACTION_MACRO
 //#define NO_ACTION_FUNCTION
-
-#endif