Migrate build target markers to keyboard.json - P (#23565)

keyboards/pierce/keyboard.json

@@ -8,6 +8,12 @@
         "pid": "0x6060",
         "device_version": "0.0.1"
     },
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
     "processor": "atmega32u4",
     "bootloader": "atmel-dfu",
     "community_layouts": ["split_3x5_3"],

keyboards/pierce/rules.mk

@@ -1,16 +1,3 @@
-# Build Options
-#   change yes to no to disable
-#
-BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
-MOUSEKEY_ENABLE = yes       # 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 = no        # Enable keyboard RGB underglow
-AUDIO_ENABLE = no           # Audio output
-
 CUSTOM_MATRIX = lite
 SRC += matrix.c
 QUANTUM_LIB_SRC += i2c_slave.c