customMK EVO70 R2 Layout Additions (#21916)

* Rename `LAYOUT` to `LAYOUT_all`

[refactor]

* Add layout/matrix diagram

[docs]

* Correct layout data

Reduce the gap between the encoder/macro section and the alphanumeric
section by 0.25u.

[enhancement]

* Add `LAYOUT_ansi_blocker`

[enhancement]

* Add `LAYOUT_iso_blocker`

[enhancement]

* Fix redundant `layout_aliases` keys

per dunk2k

[bugfix]