Add extracurricular activities url (#770)

* Add extracurricular activities url

* Allow markdown in extracurricular activities

layouts/partials/sections/education-alt.html

@@ -101,7 +101,7 @@
                                 <h6 class="text-muted">{{ i18n "extracurricular_activities" }}</h6>
                                 <ul>
                                 {{ range .extracurricularActivities }}
-                                    <li>{{ . }}</li>
+                                    <li>{{ . | markdownify }}</li>
                                 {{ end }}
                                 </ul>
                             </div>

layouts/partials/sections/education.html

@@ -101,7 +101,7 @@
                                 <h6 class="text-muted">{{ i18n "extracurricular_activities"}}</h6>
                                 <ul>
                                 {{ range .extracurricularActivities }}
-                                    <li>{{ . }}</li>
+                                    <li>{{ . | markdownify }}</li>
                                 {{ end }}
                                 </ul>
                             </div>