[Keyboard] refactor signum30 (#14527)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Stan Gurenkov <stan.gurenkov@docusign.com>

keyboards/signum/3_0/elitec/rules.mk

@@ -1,28 +0,0 @@
-# MCU name
-MCU = atmega32u4
-
-# Bootloader selection
-BOOTLOADER = atmel-dfu
-
-# Build Options
-#   comment out to disable the options.
-#
-BOOTMAGIC_ENABLE = lite     # 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
-SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
-NKRO_ENABLE = yes		# USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
-BACKLIGHT_ENABLE = no  # Enable keyboard backlight functionality
-AUDIO_ENABLE = no
-RGBLIGHT_ENABLE = no
-
-UNICODEMAP_ENABLE = no
-
-LAYOUTS = ortho_4x12
-
-# Disable unsupported hardware
-RGBLIGHT_SUPPORTED = no
-AUDIO_SUPPORTED = no
-BACKLIGHT_SUPPORTED = no