Restore trip stats link in trip list

templates/trip/list.html

@@ -53,6 +53,7 @@
   {% if item_list %}
     {% set items = item_list | list %}
     <div class="heading"><h2>{{ heading }}</h2></div>
+    <p><a href="{{ url_for("trip_stats") }}">Trip statistics</a></p>
     <p>{{ items | count }} trips</p>
 
     <div>Total distance: {{ format_distance(total_distance) }}</div>