Add link to Jenkins weekly image

jenkins/content.md

@@ -2,7 +2,9 @@
 
 The Jenkins Continuous Integration and Delivery server.
 
-This is a fully functional Jenkins server, based on the Long Term Support release [http://jenkins-ci.org/](http://jenkins-ci.org/).
+This is a fully functional Jenkins server, based on the Long Term Support release [http://jenkins.io/](http://jenkins.io/).
+
+For weekly releases check out [`jenkinsci/jenkins`](https://hub.docker.com/r/jenkinsci/jenkins/)
 
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