start the new topics route and view

app/templates/topics/topics.html

@@ -0,0 +1,23 @@
+{% from 'common/macros.html' import timestamp %}
+{%- extends 'base.html' -%}
+{%- block content -%}
+{%- for topic in topics -%}
+<div class="topic-info plank">
+  <div class="title-container">
+    <a class="info" href="{{url_for('topics.topic', slug=topic.slug)}}">{{topic.name}}</a>
+  </div>
+  <div>{{topic.description}}</div>
+  <ul class="horizontal">
+    <li>{{topic.threads_count}} {{"thread" | pluralize(topic.threads_count)}}</li>
+    <li>{{topic.posts_count}} {{"post" | pluralize(topic.posts_count)}}</li>
+  </ul>
+  <div>
+  {%- if topic.latest_post_timestamp -%}
+  Latest post at: {{timestamp(topic.latest_post_timestamp)}}
+  {%- else -%}
+  No posts yet
+  {%- endif -%}
+  </div>
+</div>
+{%- endfor -%}
+{%- endblock -%}