#121 Deferred parcels

* improves filtering by gmrkng and krs
* implements deferred loading of parcels on spatial referenced data objects
* adds HTMX to project
* improves detail view layout (mainly interesting for smaller displays/mobile)

templates/base.html

@@ -14,6 +14,7 @@
         Adds script for modal rendering. Script depends on Jquery, therefore it needs to be loaded afterwards.
     {% endcomment %}
     <script src="{% static 'js/jquery.bootstrap.modal.forms.min.js' %}"></script>
+    <script src="https://unpkg.com/htmx.org@1.6.1"></script>
     {% block head %}
     {% endblock %}
 </head>