delivery arc: appendix still curated + further-reading footers (Helm/K8s/OpenShift official docs) as site convention

content/further-reading.md

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+# Site convention - the further-reading footer (all courses)
+
+Every course page ends with a "Pre-reads + further reading" strip: official docs only
+(kubernetes.io / helm.sh / docs.redhat.com OpenShift + per-topic), two lines, quiet
+styling - a service to the reader, never a wall of links. The delivery-arc briefs
+(VI-VIII + appendix) carry theirs inline; the main-menu courses get these at build:
+
+- 00 aperitif: none (the terminal IS the hook).
+- I Docker: https://docs.docker.com/get-started/ ; image layers via
+  https://docs.docker.com/build/
+- II Machine: https://kubernetes.io/docs/concepts/overview/ ;
+  https://kubernetes.io/docs/concepts/architecture/
+- III Runtime: https://kubernetes.io/docs/concepts/workloads/pods/ ;
+  https://kubernetes.io/docs/concepts/architecture/#node-components
+- IV Traffic: https://kubernetes.io/docs/concepts/services-networking/
+- V OpenShift: https://docs.redhat.com/en/documentation/openshift_container_platform ;
+  https://www.redhat.com/en/technologies/cloud-computing/openshift
+- VI-VIII + appendix: inline in their briefs (content/).
+
+Pre-reads point BACKWARD into the site first (courses build on courses), outward second.