Make snip public index available if not logged in

templates/snip/single.html.twig

@@ -3,9 +3,15 @@
 {% set title %}Snip {{ snip }}{% endset %}
 
 {% block body %}
-    <a href="{{ path('snip_index') }}" class="btn btn-primary">
-        <i class="fa fa-arrow-left"></i> Back
-    </a>
+    {% if app.user %}
+        <a href="{{ path('snip_index') }}" class="btn btn-primary">
+            <i class="fa fa-arrow-left"></i> Back
+        </a>
+    {% else %}
+        <a href="{{ path('snip_public') }}" class="btn btn-primary">
+            <i class="fa fa-arrow-left"></i> Index
+        </a>
+    {% endif %}
     {% if is_granted('edit', snip) %}
         <a class="btn btn-warning" href="{{ path('snip_edit', {snip: snip.id}) }}">
             <i class="fa fa-pencil" aria-hidden="true"></i> Edit