Note pages.json among the files living on the data volume

Dockerfile

@@ -7,9 +7,9 @@
 #
 # Two stages: the wheel is built from the src layout, then installed into a venv
 # in a clean image, so the runtime layer carries no build tooling and no second
-# copy of the source.  data/ is a volume: the services store (and users.json)
-# live there, so edits survive a restart and the host's internal URLs never get
-# baked into a layer.
+# copy of the source.  data/ is a volume: the services store, users.json and
+# pages.json live there, so edits survive a restart and the host's internal URLs
+# never get baked into a layer.
 
 ARG PYTHON_VERSION=3.11