simpler check and deps messages

rig/ctrl/docs.sh

@@ -1,16 +1,7 @@
 #!/usr/bin/env bash
-# Documentation: render the diagrams, and serve the pages.
-#
-# The docs are the instructions for building the cluster, so they must work
-# BEFORE anything else exists. That rules out serving them from the cluster, and
-# it rules out python -m http.server too — a minimal Debian has no python3. What
-# it does have, by definition, is Docker: the single prerequisite rig already
-# demands. So a throwaway nginx container serves a read-only bind mount.
-#
-# Rendered SVGs are committed alongside their .dot sources for the same reason:
-# the pages have to read on a machine with no Graphviz installed.
-#
+# Documentation: render the diagrams, and serve the pages from a throwaway nginx container.
 # Usage: docs.sh serve | graphs
+# Notes: docs/notes/docs.md
 set -euo pipefail
 cd "$(dirname "$0")"