Allow browsing public snips

Fixed big with branch name not existing if nothing committed

templates/snip/single.html.twig

@@ -27,7 +27,19 @@
             <p class="card-text">Current branch: {{ branch }}</p>
         </div>
         <div class="card-body">
-            <p class="card-text">{{ content|nl2br }}</p>
+            <pre><code>{{ content }}</code></pre>
         </div>
     </div>
+{% endblock %}
+
+{% block css %}
+    {{ parent() }}
+    <link rel="stylesheet"
+          href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/default.min.css">
+{% endblock %}
+
+{% block js %}
+    {{ parent() }}
+    <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js"></script>
+    <script>hljs.highlightAll();</script>
 {% endblock %}