Fix KBDPad MKI backlight, Num Lock LEDs; clean up firmware a bit (#6883)

* Update keyboard kit URL

* Replace custom RGB driver with new one from #7183

* Replace backlight with standard impl

* Remove some unnecessary default settings

* Disable COMMAND since docs want it off by default

(There's no working IS_COMMAND set for this board anyway, so it's
already a nop.)

keyboards/kbdfans/kbdpad/mk1/config.h

@@ -27,12 +27,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROWS 6
 #define MATRIX_COLS 4
 
-//                        0   1   2   3   4   5   
 #define MATRIX_ROW_PINS { B0, B1, B2, B3, B4, B5 }
 #define MATRIX_COL_PINS { A0, A1, A2, A3 }
-#define UNUSED_PINS
 
 #define DIODE_DIRECTION COL2ROW
-#define DEBOUNCE 5
 
-#define BACKLIGHT_LEVELS 1
+#define BACKLIGHT_PIN D4
+#define BACKLIGHT_BREATHING
+
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 6