Keymap Fixes for 7U layout, RGB and Audio support (#2779)

- confused KC_COMM, KC_SLSH, KC_DOT order
 - KC_INS -> KC_DEL
 - Document audio on C4 and B7, set default RGB to pin C6

keyboards/clueboard/2x1800/config.h

@@ -69,6 +69,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* Locking resynchronize hack */
 #define LOCKING_RESYNC_ENABLE
 
+#define RGB_DI_PIN C6
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 16
+#define RGBLIGHT_HUE_STEP 8
+#define RGBLIGHT_SAT_STEP 8
+#define RGBLIGHT_VAL_STEP 8
+
 /* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
  * This is userful for the Windows task manager shortcut (ctrl+shift+esc).
  */