[Keymap] Moar personal keymap and userspace tweaks (#7238)

[Keymap] Moar personal keymap and userspace tweaks (#7238)

* Enable link-time optimization

* Make RGB static gradient ranges shorter

* Shift Quefrency media keys to the right

* Shift KBD67 media keys to the right

* Move some 60% keys from function to adjust layer

* Set "extra" Lily58 keys to browser back/forward

* Remove Instant60 EEPROM hack after #6968

* Remove unnecessary bits from macropad keymaps

* Update KLE images