big update based on real wokr

rig/docs/notes/docs.md

@@ -8,6 +8,12 @@ out `python -m http.server` too — a minimal Debian has no python3. What it doe
 have, by definition, is Docker: the single prerequisite rig already demands. So a
 throwaway nginx container serves a read-only bind mount.
 
+It runs with a config of its own: one worker (nginx's `auto` starts one per core,
+twelve on an ordinary laptop, for a handful of static pages), no access log and a
+quiet entrypoint, so the terminal shows the URL and nothing else unless something
+fails. The pages declare an empty icon, so the browser does not ask for a
+`favicon.ico` that is not there.
+
 ## Committed SVGs
 
 Rendered SVGs are committed alongside their `.dot` sources for the same reason: