update reading group link due to refactoring

Author: ryanphuang

_includes/banner.html

@@ -17,7 +17,7 @@
             <li class="nav-item {% if current[1] == 'pubs' %}'active'{% endif %}"><a class="nav-link" href="{{ '/pubs.html' | relative_url }}">Publications</a>
             <li class="nav-item {% if current[1] == 'projects' %}'active'{% endif %}"><a class="nav-link" href="{{ '/projects.html' | relative_url }}">Projects</a></li>
             <li class="nav-item {% if current[1] == 'software' %}'active'{% endif %}"><a class="nav-link" href="{{ '/software.html' | relative_url }}">Software</a></li>
-            <li class="nav-item"><a class="nav-link" href="https://orderlab.io/reading-group/current" target="_blank">Reading</a></li>
+            <li class="nav-item"><a class="nav-link" href="https://orderlab.io/reading-group" target="_blank">Reading</a></li>
             <li class="nav-item {% if current[1] == 'join' %}'active'{% endif %}"><a class="nav-link" href="{{ '/join.html' | relative_url }}">Join</a></li>
           </ul>
         </div>