Track dates of English school holidays

Fixes #168

templates/holiday_list.html

@@ -4,7 +4,7 @@
 
 {% block content %}
 <div class="container-fluid mt-2">
-  <h1>Holidays</h1>
+  <h1>Public holidays</h1>
   <table class="table table-hover w-auto">
   {% for item in items %}
     {% set country = get_country(item.country) %}
@@ -20,5 +20,17 @@
     </tr>
   {% endfor %}
   </table>
+
+  <h2>UK school holidays (Bristol)</h2>
+  <table class="table table-hover w-auto">
+  {% for item in school_holidays %}
+    <tr>
+      <td class="text-end">{{ display_date(item.as_date) }}</td>
+      <td>to {{ display_date(item.end_as_date) }}</td>
+      <td>in {{ (item.as_date - today).days }} days</td>
+      <td>{{ item.title }}</td>
+    </tr>
+  {% endfor %}
+  </table>
 </div>
 {% endblock %}