Allow deleting snips (including git repo)

templates/form.html.twig

@@ -0,0 +1,6 @@
+{% extends 'base/base.html.twig' %}
+
+{% block body %}
+    <h3>{{ message }}</h3>
+    {{ form(form) }}
+{% endblock %}

templates/snip/single.html.twig

@@ -13,6 +13,9 @@
         <a class="btn btn-info" href="{{ path('history_index', {snip: snip.id}) }}">
             <i class="fa fa-history" aria-hidden="true"></i> History
         </a>
+        <a href="{{ path('snip_delete', {snip: snip.id}) }}" class="btn btn-danger">
+            <i class="fa fa-trash"></i> Delete
+        </a>
     {% endif %}
     <a href="{{ path('snip_raw', {snip: snip.id}) }}" class="btn btn-danger">
         <i class="fa fa-eye"></i> Raw