Remove broken links

Author: Qianqianye

src/templates/pages/learn/debugging.hbs

@@ -172,10 +172,8 @@ slug: learn/
           This guide has been inspired by several other fantastic resources on debugging when coding. Some of these are here:
         </p>
           <ul class="list_view">
-            <li>Matt Gemmel, <a href="http://mattgemmell.com/what-have-you-tried/">What have you tried?</a></li>
             <li>Clay Shirky, <a href="https://vimeo.com/channels/debugging">A brief introduction to debugging</a></li>
             <li>Eric Steven Raymond, <a href="http://www.catb.org/esr/faqs/smart-questions.html"> How to ask questions the smart way</a></li>
-            <li>ITP Residents, <a href="https://docs.google.com/presentation/d/1RXzITwS4otVKnYkuNu2w7CrpYy35WBO2HUlmkSc2p8g/edit?copiedFromTrash#slide=id.g2ffb36b3_0_44">10 Tips for Debugging</a></li>
             <li>Rurouni Jones, <a href="http://rurounijones.github.io/blog/2009/03/17/how-to-ask-for-help-on-irc//">How to ask for help on IRC</a></li>
           </ul>
       </div>