Add details about security upgrades and mention Nautilus

www/htdocs/index.html

@@ -2574,6 +2574,27 @@ of this workshop.
 
 ---
 
+## How do we know when to upgrade?
+
+- Subscribe to CVE notifications
+  
+  - https://cve.mitre.org/
+
+  - your distros' security announcements
+
+- Check CVE status in official images
+  <br/>(tag [cve-tracker](
+  https://github.com/docker-library/official-images/labels/cve-tracker)
+  in [docker-library/official-images](
+  https://github.com/docker-library/official-images/labels/cve-tracker)
+  repo)
+
+- Coming soon: Project Nautilus
+  <br/>(see [this DC15EU presentation](
+  http://www.slideshare.net/Docker/official-repos-and-project-nautilus/26))
+
+---
+
 ## Upgrading with Compose
 
 Compose makes this particularly easy: