Add weekend availability view

Closes: #130

templates/navbar.html

@@ -7,6 +7,7 @@
   {"endpoint": "travel_list", "label": "Travel" },
   {"endpoint": "accommodation_list", "label": "Accommodation" },
   {"endpoint": "gaps_page", "label": "Gaps" },
+  {"endpoint": "weekends", "label": "Weekends" },
   {"endpoint": "launch_list", "label": "Space launches" },
   {"endpoint": "holiday_list", "label": "Holidays" },
 ] %}

templates/weekends.html

@@ -0,0 +1,44 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="p-2">
+
+  <h1>Weekends</h1>
+  <table class="table table-hover w-auto">
+    <thead>
+      <tr>
+        <th class="text-end">Week</th>
+        <th class="text-end">Date</th>
+        <th>Saturday</th>
+        <th>Sunday</th>
+      </tr>
+    </thead>
+    <tbody>
+
+  {% for weekend in items %}
+  <tr>
+    <td class="text-end">
+        {{ weekend.date.isocalendar().week }}
+    </td>
+    <td class="text-end">
+        {{ weekend.date.strftime("%-d %b %Y") }}
+    </td>
+    {% for day in "saturday", "sunday" %}
+      <td>
+        {% if weekend[day] %}
+          {% for event in weekend[day] %}
+            <a href="{{ event.url }}">{{ event.title }}</a>{% if not loop.last %},{%endif %}
+          {% endfor %}
+        {% else %}
+          <em>🆓 🍃 📖</em>
+        {% endif %}
+      </td>
+    {% endfor %}
+    </tr>
+  {% endfor %}
+    </tbody>
+  </table>
+</div>
+
+{% endblock %}
+