Update dd.html

dd.html

@@ -64,7 +64,7 @@
   best way to start is by visiting the doc of our products, and the doc of the technologies (programming language, webserver, devops,
   etc.) you are going to use in your places.<br><br>
 
-  If you think that any information of our website is wrong or missing, please contact us <a href="http://5md.link/l/email">here</a>.<br><br>
+  If you think that any information of our website is wrong or missing, please contact us <a href="http://5md.at/l/email">here</a>.<br><br>
 
   Now for the legalese.<br><br>