Add AXIS control logic relationship map

scripts/render_axis_control_logic_png.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+source_file="${repo_root}/docs/linuxcnc-axis-web-control-panel-source-logic.dot"
+output_file="${repo_root}/docs/linuxcnc-axis-web-control-panel-source-logic.png"
+
+dot -Tpng -Gdpi=155 "${source_file}" -o "${output_file}"
+identify "${output_file}"