Re-add LED support

This reverts commit 5b069a0104.

docs/split_keyboards.md

@@ -2,13 +2,22 @@
 Split keyboards are mostly the same as unsplit and very easy to adapt a keymap for. Currently
 UART is supported, though other modes will come later such as Bluetooth and i2c.
 
+
+## UART
+To enable uart it's as simple as adding this line, of course changing the pin
+```python
+keyboard.split_type = "UART"
+keyboard.uart_pin = board.SCL
+```
+
+## Config
 Useful config options:
 ```python
 keyboard.split_flip = True  # If your boards are identical but one is flipped, this option is for you 
 keyboard.split_offsets = [6, 6, 6, 6]  # This is the how many keys are on each column on the "Master" half
 ```
 
-## EE HANDS
+### EE HANDS
 If you want to plug in on either side, it can be done fairly easily but requires setup. 
 
 On each half of your keyboard make a file called kmk_side.py and add one of these lines to the file
@@ -24,9 +33,3 @@ and then in your keymap, add the line
 from kmk_side import split_side
 ```
 
-# UART
-To enable uart it's as simple as adding this line, of course changing the pin
-```python
-keyboard.split_type = "UART"
-keyboard.uart_pin = board.SCL
-```