Migrate build target markers to keyboard.json - N (#23589)

keyboards/nullbitsco/nibble/keyboard.json

@@ -7,6 +7,17 @@
         "pid": "0x6060",
         "device_version": "0.0.1"
     },
+    "build": {
+        "lto": true
+    },
+    "features": {
+        "bootmagic": false,
+        "encoder": true,
+        "extrakey": true,
+        "mousekey": false,
+        "nkro": true,
+        "rgblight": true
+    },
     "encoder": {
         "rotary": [
             {"pin_a": "B5", "pin_b": "B4"}

keyboards/nullbitsco/nibble/rules.mk

@@ -1,22 +1,9 @@
-# Build Options
-#   change yes to no to disable
-#
-BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
-MOUSEKEY_ENABLE = no        # Mouse keys
-EXTRAKEY_ENABLE = yes       # Audio control and System control
-CONSOLE_ENABLE = no         # Console for debug
-COMMAND_ENABLE = no         # Commands for debug and configuration
-NKRO_ENABLE = yes           # Enable N-Key Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
-RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
-AUDIO_ENABLE = no           # Audio output
-ENCODER_ENABLE = yes        # Use rotary encoder
-LTO_ENABLE = yes            # Link-time optimization
-CUSTOM_MATRIX = lite        # Lite custom matrix
+CUSTOM_MATRIX = lite
+
+UART_DRIVER_REQUIRED = yes
 
 # Project specific files
 SRC += matrix.c \
        common/bitc_led.c \
        big_led.c \
        common/remote_kb.c
-UART_DRIVER_REQUIRED = yes