Skeletn87 - Fix RGB pin (#14170)

* add Skeletn87

* update skeletn87 files

* update skeletn87 soldered

* update readme image

* update readme (again)

* fix skeletn87 indicator LEDs

* fix led pin for production PCB

keyboards/skeletn87/soldered/config.h

@@ -45,7 +45,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define BACKLIGHT_LEVELS 8
 #define BACKLIGHT_BREATHING
 
-#define RGB_DI_PIN B3
+#define RGB_DI_PIN B2
 #ifdef RGB_DI_PIN
 #define RGBLIGHT_ANIMATIONS
 #define RGBLED_NUM 10