refactor(make): rename compose targets to up/prod/down/clean

Concise verbs: make up (dev build+run), make prod (pull published image),
make down (stop regardless of mode), make clean (down + drop local image).
Updates all docs and compose-file comment headers to match.

docker-compose.prod.yml

@@ -2,7 +2,7 @@
 # Layer it on top of docker-compose.yml; it reuses every setting there (env, ports,
 # extra_hosts) and only swaps the local build for the latest published image.
 #
-#   make compose-up-prod
+#   make prod
 #   docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
 services:
   openconcho: