Fix broken links.

docs/web/cdist.mdwn

@@ -6,10 +6,10 @@ cdist is a usable configuration management system.
 It adheres to the KISS principle and 
 is being used in small up to enterprise grade environments.
 cdist is an alternative to other configuration management systems like
-[bcfg2](http://trac.mcs.anl.gov/projects/bcfg2),
-[chef](http://wiki.opscode.com/display/chef/),
-[cfengine](http://www.cfengine.org/)
-and [puppet](http://www.puppetlabs.com/).
+[bcfg2](http://bcfg2.org/),
+[chef](https://www.chef.sh/),
+[cfengine](https://cfengine.com/)
+and [puppet](https://puppet.com/).
 
  * [[Why should I use cdist?|why]]
  * [[Documentation|documentation]]