Update links to user and developer help forums

Author: KirstieJane

doc/_templates/indexsidebar.html

@@ -4,7 +4,7 @@ <h3>{{ _('Links') }}</h3>
 <ul>
     <li>Docs: <a href="http://nipy.org/nipype">Stable</a> · <a href="http://nipype.readthedocs.org/en/latest/">Dev</a></li>
     <li>Code: <a href="http://github.com/nipy/nipype">Github</a> · <a href="http://github.com/nipy/nipype/issues">Bugs-Requests</a></li>
-    <li>Forum: <a href="http://neurostars.org/t/nipype">User</a> · <a href="http://projects.scipy.org/mailman/listinfo/nipy-devel">Developer</a></li>
+    <li>Forum: <a href="https://neurostars.org/search?q=nipype">User</a> · <a href="https://mail.python.org/mailman/listinfo/neuroimaging">Developer</a></li>
     <li><a href="about.html#funding">Funding</a> · <a href="http://nipy.org/software/license/index.html"><img src="https://img.shields.io/pypi/l/nipype.svg" alt="License"></a></li>
     <li><a href="https://travis-ci.org/nipy/nipype"><img src="https://travis-ci.org/nipy/nipype.png?branch=master" alt="travis"></a> · <a href='https://codecov.io/gh/nipy/nipype'><img src='https://codecov.io/gh/nipy/nipype/branch/master/graph/badge.svg' alt='Coverage Status' /></a></li>
     <a href='https://pypi.python.org/pypi/nipype/'><img src='https://img.shields.io/pypi/pyversions/nipype.svg' alt='Python Versions' /></a></li>