Update sidebar links from Bitbucket to GitHub

Author: nicoddemus

doc/en/_templates/links.html

@@ -3,9 +3,9 @@ <h3>Useful Links</h3>
   <li><a href="{{ pathto('index') }}">The pytest Website</a></li>
   <li><a href="{{ pathto('contributing') }}">Contribution Guide</a></li>
   <li><a href="https://pypi.python.org/pypi/pytest">pytest @ PyPI</a></li>
-  <li><a href="https://bitbucket.org/pytest-dev/pytest/">pytest @ Bitbucket</a></li>
+  <li><a href="https://github.com/pytest-dev/pytest/">pytest @ GitHub</a></li>
   <li><a href="http://pytest.org/latest/plugins_index/index.html">3rd party plugins</a></li>
-  <li><a href="https://bitbucket.org/pytest-dev/pytest/issues?status=new&status=open">Issue Tracker</a></li>
+  <li><a href="https://github.com/pytest-dev/pytest/issues">Issue Tracker</a></li>
   <li><a href="http://pytest.org/latest/pytest.pdf">PDF Documentation</a>
 </ul>