Add API functionality

app/templates/_sidenav.html.j2

@@ -31,6 +31,9 @@
   {% if current_user.can(Permission.ADMINISTRATE) %}
   <li><a href="{{ url_for('admin.index') }}"><i class="material-icons">admin_panel_settings</i>Administration</a></li>
   {% endif %}
+  {% if current_user.can(Permission.USE_API) %}
+  <li><a href="{{ url_for('apifairy.docs') }}"><i class="material-icons">api</i>API</a></li>
+  {% endif %}
   {% if current_user.can(Permission.CONTRIBUTE) %}
   <li><a href="{{ url_for('contributions.contributions') }}"><i class="material-icons">new_label</i>Contribute</a></li>
   {% endif %}