New keyboard keymap, small keymap updates to mm2 keymap (#12310)

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

keyboards/preonic/keymaps/arkag/rules.mk

@@ -0,0 +1,17 @@
+BOOTMAGIC_ENABLE = lite
+MOUSEKEY_ENABLE = no
+STENO_ENABLE = no
+EXTRAKEY_ENABLE = yes
+CONSOLE_ENABLE = no
+COMMAND_ENABLE = no
+SLEEP_LED_ENABLE = yes
+NKRO_ENABLE = yes
+BACKLIGHT_ENABLE = no
+AUDIO_ENABLE = yes
+RGBLIGHT_ENABLE = yes
+TAP_DANCE_ENABLE = no
+UNICODE_ENABLE = yes
+LEADER_ENABLE = yes
+
+# from default
+SRC += muse.c