add issue template

.gitlab/issue_templates/typo.md

+<!--
+Thanks for providing feedback!
+
+Please provide the information below.
+-->
+
+## File in which the problem appears
+
+## Problematic sentence
+
+## Correct version

_layouts/website/summary.html

@@ -52,6 +52,6 @@
     {% endfor %}
     <li class="divider"></li>
     <li>
-      <a href="https://gitlab.kwant-project.org/ssp/ssp_lectures/issues">Report a typo</a>
+      <a href="https://gitlab.kwant-project.org/solidstate/lectures/issues/new?issuable_template=typo">Report a typo</a>
     </li>
 </ul>