Use card layout in instance list

src/servala/frontend/templates/frontend/organizations/service_instances.html

@@ -1,6 +1,11 @@
 {% extends "frontend/base.html" %}
-{% block content %}
-    <h1>Service Instances for {{ organization.name }}</h1>
+{% load i18n static %}
+{% block html_title %}
+    {% block page_title %}
+        {% translate "Instances" %}
+    {% endblock page_title %}
+{% endblock html_title %}
+{% block card_content %}
     <ul>
         {% for instance in instances %}
             <li>