* refactor iso keymap
- remove redundant action_layer.h include
- use enum for layer management
- QMK coding conventions (four-space indent)
* add LAYOUT_60_iso macro
* enable 60_iso community layout for both revisions
* swap KC_HOME to KC_RSFT
* update ISO keymap readme
* update default keymap readme
`make` command no longer valid.
* refactor keyboard readme
Update to reflect current QMK template.
* add LAYOUT_60_iso data to info.json
* use #pragma once in header files
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