Init: Corne-only zmk-config

Extracted from zmk-config-archive (multi-board repo).
Corne 42-key with nice_nano_v2, nice_oled, RGB, ZMK Studio, Javelin steno.

build.yaml

@@ -0,0 +1,20 @@
+---
+include:
+
+  ### CORNE START ###
+  - board: nice_nano_v2
+    shield: corne_left nice_oled
+    artifact-name: nice_corne_left_oled_rgb
+    snippet: rgb-config studio-rpc-usb-uart
+  - board: nice_nano_v2
+    shield: corne_right nice_oled
+    cmake-args: -DCONFIG_NICE_OLED_WIDGET_ANIMATION_PERIPHERAL_CAT=n -DCONFIG_NICE_OLED_WIDGET_ANIMATION_PERIPHERAL_KM=y
+    artifact-name: nice_corne_right_oled_rgb
+    snippet: rgb-config
+  ### CORNE END ###
+
+  ### SETTINGS_RESET START ###
+  - board: nice_nano_v2
+    shield: settings_reset
+    artifact-name: nice_settings_reset
+  ### SETTINGS_RESET END ###