[Keyboard] Refactor xs60 with soldered and hotswap version (#19049)

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/xelus/xs60/soldered/rules.mk

@@ -0,0 +1,27 @@
+# MCU name
+MCU = STM32L422
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# 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 = yes        # 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
+AUDIO_ENABLE = no           # Audio output
+
+EEPROM_DRIVER = i2c
+
+RGBLIGHT_ENABLE = yes
+WS2812_DRIVER = bitbang
+
+LTO_ENABLE = yes
+OPT = 2
+
+LAYOUTS = 60_ansi_split_bs_rshift