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.

boards/shields/corne/Kconfig.defconfig

@@ -0,0 +1,58 @@
+if SHIELD_CORNE_LEFT || SHIELD_CORNE_DONGLE_XIAO || SHIELD_CORNE_DONGLE_PRO_MICRO
+
+config ZMK_KEYBOARD_NAME
+    default "Corne"
+
+config ZMK_SPLIT_ROLE_CENTRAL
+    default y
+
+# if SHIELD_CORNE_DONGLE_XIAO || SHIELD_CORNE_DONGLE_PRO_MICRO
+
+# config ZMK_USB
+#     default y
+
+# endif
+
+endif
+
+if SHIELD_CORNE_LEFT || SHIELD_CORNE_RIGHT || SHIELD_CORNE_LEFT_PERIPHERAL || SHIELD_CORNE_DONGLE_XIAO || SHIELD_CORNE_DONGLE_PRO_MICRO
+
+config ZMK_SPLIT
+    default y
+
+if ZMK_DISPLAY
+
+config I2C
+    default y
+
+config SSD1306
+    default y
+
+if SHIELD_CORNE_DONGLE_XIAO || SHIELD_CORNE_DONGLE_PRO_MICRO
+
+choice ZMK_DISPLAY_WORK_QUEUE
+    default ZMK_DISPLAY_WORK_QUEUE_DEDICATED
+endchoice
+
+endif
+
+endif # ZMK_DISPLAY
+
+if LVGL
+
+config LV_Z_VDB_SIZE
+    default 64
+
+config LV_DPI_DEF
+    default 148
+
+config LV_Z_BITS_PER_PIXEL
+    default 1
+
+choice LV_COLOR_DEPTH
+    default LV_COLOR_DEPTH_1
+endchoice
+
+endif # LVGL
+
+endif