The keymap configuration to include in your zmk config.
You can import this file along with armadillo.keymap to nickcoutsos.github.io for a nice visualization of the layout. However, this tool doesn't pick up key combos. I visualized them by hand in the symbols layer by adding an icon between two keys. The combos are available in any layer.
The full zmk config can be found over at rngcntr/zmk-config.
WARNING: The pin config differs from the one defined by the PCB by one pin, because the pin in question was damaged on my controller. I only noticed this once the PCB was already produced. Flashing this version without modification will cause one column to be ignored.