Refactor key bindings in charybdis.keymap #86

Job	Run time
build / Fetch Build Keyboards	5s
build / Build (nice_nano_v2, charybdis_left)	1m 3s
build / Build (nice_nano_v2, charybdis_right)	1m 3s
build / Build (nice_nano_v2, settings_reset)	1m 29s
build / Merge Output Artifacts	0s
	3m 40s

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