Add gaps web page template

templates/gaps.html

@@ -0,0 +1,19 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="p-2">
+
+<h1>Gaps</h1>
+<table class="table table-hover w-auto">
+{% for start, end in gaps %}
+<tr>
+  <td class="text-end">{{ start.strftime("%A, %-d %b %Y") }}</td>
+  <td class="text-end">{{ end.strftime("%A, %-d %b %Y") }}</td>
+  <td>{{ (end - start).days }} days</td>
+</tr>
+{% endfor %}
+</table>
+</div>
+
+{% endblock %}
+