Refactor nibble / update to match build docs (#620)

* feat(nibble): add underglow support for nice_nano builds

* feat(nibble): add encoder to top, left most column to match standard assembly documentation

* refactor(nibble): add layer labels

* feat(nibble): add support for optional display ; off by default

* feat(nibble): add README

* fix(nibble): adjust oled rotation for easier reading

* fix(nibble): add additional note about enabling oled

* refactor(nibble): convert keymap to use tabs instead of spaces

* refactor(nibble): enable oled in dts/overlay by default

* refactor(nibble): cleanup alignment and formatting in nibble keymap

* refactor(nibble): re-align top most row of keymap to be sensible

* refactor(nibble): cleanup kscan map alignment

* refactor(nibble): indent first row of map/transform to properly align with physical columns

* fix(nibble): remove dangling code block from readme

Co-authored-by: KemoNine <mcrosson@kemonine.info>

app/boards/shields/nibble/README.md

@@ -0,0 +1,29 @@
+# Building ZMK for the Nibble
+
+Some general notes/commands for building standard nibble layouts from the assembly documentation.
+
+## LED Notes
+
+If you built your nibble without the LEDs _and_ are using a nice!nano board, you'll need to change the following in your local nibble config or add them to the end of the file.
+
+```
+CONFIG_ZMK_RGB_UNDERGLOW=n
+CONFIG_WS2812_STRIP=n
+```
+
+## Encoder Notes
+
+If you built your nibble without an encoder, you'll need to change the following in your local nibble config or add them to the end of the file.
+
+```
+CONFIG_EC11=n
+CONFIG_EC11_TRIGGER_GLOBAL_THREAD=n
+```
+
+## OLED Builds
+
+If using an OLED screen, you'll need to change the following in your local nibble config or add them to the end of the file.
+
+```
+CONFIG_ZMK_DISPLAY=y
+```