Add page showing list of series

Resolves: #17

templates/series/list.html

@@ -0,0 +1,38 @@
+{% extends "base.html" %}
+
+{% block title %}Series – Conference archive{% endblock %}
+
+  {% block content %}
+  <h1>Conference archive</h1>
+
+  <p>{{ items.count() }} series found</p>
+    {% for item in items %}
+      <h3>{{ item.name }}</h3>
+      {% for conf in item.conferences %}
+
+  <div style="margin-bottom:1.5rem">
+    👥
+    <a href="{{ url_for("conference_page", short_name=conf.short_name) }}">{{ conf.title }}</a>
+    📅
+    {{ conf.start.strftime("%d %b %Y") }}
+    <br/>
+    {% if conf.venue %}
+      📍
+      {{ conf.venue.name }}
+      &ndash;
+      {{ conf.venue.city.name }},
+      {{ conf.venue.city.country.name }}
+      {{ conf.venue.city.country.flag }}
+    <br/>
+    {% endif %}
+
+    {{ (conf.end - conf.start).days + 1 }} days,
+    {{ conf.events.count() }} talks,
+    {{ conf.people_detail.count() }} speakers<br/>
+  </div>
+
+
+      {% endfor %}
+    {% endfor %}
+
+{% endblock %}