Add keymap-drawer workflow

I haven't tuned the output. For now this is just a demonstration of the
workflow.

keymap_drawer.nix

@@ -1,46 +0,0 @@
-{
-  lib,
-  buildPythonApplication,
-  fetchPypi,
-  poetry-core,
-  pydantic,
-  pcpp,
-  pyparsing,
-  pyyaml,
-  platformdirs,
-  pydantic-settings,
-}:
-buildPythonApplication rec {
-  pname = "keymap-drawer";
-  version = "0.18.0";
-  pyproject = true;
-
-  src = fetchPypi {
-    pname = "keymap_drawer";
-    inherit version;
-    hash = "sha256-faJB+cjj740Ny2wqVwc5t/+grEWBIEyhex3RoLCuIs8=";
-  };
-
-  postPatch = ''
-    substituteInPlace pyproject.toml --replace 'platformdirs = "^3.5.1"' 'platformdirs = "^4.0.0"'
-  '';
-
-  build-system = [poetry-core];
-
-  propagatedBuildInputs = [
-    pydantic
-    pcpp
-    pyparsing
-    pyyaml
-    platformdirs
-    pydantic-settings
-  ];
-
-  doCheck = false;
-
-  meta = {
-    homepage = "https://github.com/caksoylar/keymap-drawer";
-    description = "Parse QMK & ZMK keymaps and draw them as vector graphics";
-    license = lib.licenses.mit;
-  };
-}