doc: redirect software-carpentry sc_track link to wayback machine.

Author: rouilj

doc/html_extra/spec.html

@@ -1540,7 +1540,7 @@ <h2>10. Acknowledgements</h2>
 <td>&nbsp;&nbsp;&nbsp;<a href="http://www.software-carpentry.com/sc_config/"><b>[Configure]</b></a>&nbsp;&nbsp;&nbsp;</td>
 <td>&nbsp;&nbsp;&nbsp;<a href="http://www.software-carpentry.com/sc_build/"><b>[Build]</b></a>&nbsp;&nbsp;&nbsp;</td>
 <td>&nbsp;&nbsp;&nbsp;<a href="http://www.software-carpentry.com/sc_test/"><b>[Test]</b></a>&nbsp;&nbsp;&nbsp;</td>
-<td>&nbsp;&nbsp;&nbsp;<a href="http://www.software-carpentry.com/sc_track/"><b>[Track]</b></a>&nbsp;&nbsp;&nbsp;</td>
+<td>&nbsp;&nbsp;&nbsp;<a href="https://web.archive.org/web/20010828124306/http://software-carpentry.codesourcery.com/sc_track"><b>[Track]</b></a>&nbsp;&nbsp;&nbsp;</td>
 <td>&nbsp;&nbsp;&nbsp;<a href="http://www.software-carpentry.com/biblio.html"><b>[Resources]</b></a>&nbsp;&nbsp;&nbsp;</td>
 <td>&nbsp;&nbsp;&nbsp;<a href="http://www.software-carpentry.com/lists/"><b>[Archives]</b></a>&nbsp;&nbsp;&nbsp;</td>
 </tr>