Add link, clarify that images are "semi-official"

Author: kocolosk

README.md

@@ -1,11 +1,12 @@
 # CouchDB StatefulSet Assembler
 
 This code is intended to be deployed as a sidecar container in a Pod alongside
-the official CouchDB container when running CouchDB as a Kubernetes StatefulSet.
-It will resolve the DNS records maintained by Kubernetes to discover the other
-peers in the cluster, then automatically populate the Pod's _nodes DB with the
-names of the other nodes. The end result is that the cluster is automically
-joined up.
+the [semi-official CouchDB Docker
+image](https://hub.docker.com/r/apache/couchdb/) when running CouchDB as a
+Kubernetes StatefulSet. It will resolve the DNS records maintained by Kubernetes
+to discover the other peers in the cluster, then automatically populate the
+Pod's _nodes DB with the names of the other nodes. The end result is that the
+cluster is automically joined up.
 
 If the deployment is scaled *up* after the initial creation those new Pods will
 be automatically added. Scaling *down* does not automatically remove the Pods