Adding pervasive column sorting

app/templates/admin/_sort_macros.html

@@ -0,0 +1,13 @@
+{% macro sort_th(key, label, sort_headers) %}
+  {% if sort_headers and key in sort_headers %}
+    {% set h = sort_headers[key] %}
+    <th>
+      <a href="#" class="sort-link{{ ' active' if h.active else '' }}"
+         hx-get="{{ h.url }}"
+         hx-target="{{ h.target_id }}"
+         hx-swap="outerHTML">{{ label }}{% if h.active %}<span aria-hidden="true">{{ ' ▲' if h.dir == 'asc' else ' ▼' }}</span>{% endif %}</a>
+    </th>
+  {% else %}
+    <th>{{ label }}</th>
+  {% endif %}
+{% endmacro %}