add the schedule on the right of the blog

_config.yml

@@ -14,6 +14,8 @@ navigation:
   url: index.html
 - title: Twitter
   url: https://twitter.com/MozillaReleases
+- title: Schedule
+  url: http://release.mozilla.org/planning/2015/01/13/release-schedule.html
 
 
 github: {