Remove two dead links

Doc/tools/sphinxext/indexsidebar.html

@@ -12,12 +12,10 @@
             <ul>
               {# XXX: many of these should probably be merged in the main docs #}
               <li><a href="http://www.python.org/doc/faq/">FAQs</a></li>
-              <li><a href="http://www.python.org/doc/intros/">Introductions</a></li>
               <li><a href="http://www.python.org/doc/essays/">Guido's Essays</a></li>
               <li><a href="http://www.python.org/doc/newstyle/">New-style Classes</a></li>
               <li><a href="http://www.python.org/dev/peps/">PEP Index</a></li>
               <li><a href="http://wiki.python.org/moin/BeginnersGuide">Beginner's Guide</a></li>
-              <li><a href="http://www.python.org/topics/">Topic Guides</a></li>
               <li><a href="http://wiki.python.org/moin/PythonBooks">Book List</a></li>
               <li><a href="http://www.python.org/doc/av/">Audio/Visual Talks</a></li>
               <li><a href="http://www.python.org/doc/other/">Other Doc Collections</a></li>