E88 Layout Macro Additions (qmk#20612)

* add matrix_diagram.md

* info.json: apply friendly formatting

* refactor keymaps

- use four-space indent
- grid-align keycodes
- use QMK-native alias for `KC_TRNS`

* add LAYOUT_tkl_f13_ansi

* add LAYOUT_tkl_f13_ansi_split_rshift

* add LAYOUT_tkl_f13_ansi_tsangan

* add LAYOUT_tkl_f13_ansi_tsangan_split_rshift

* add LAYOUT_tkl_f13_iso

* add LAYOUT_tkl_f13_iso_split_rshift

* add LAYOUT_tkl_f13_iso_tsangan

* add LAYOUT_tkl_f13_iso_tsangan_split_rshift

* enable Community Layout support

* Apply suggestions from code review