add user started threads view

app/templates/threads/thread.html

@@ -74,6 +74,14 @@
     {{- pager(page, page_count) -}}
   </fieldset>
 </div>
+<div id="new-post-toast" class="plank even contrast-bg hidden">
+  <span>New post in thread!</span>
+  <span class="notification-buttons">
+    <button>Dismiss</button>
+    <button>View post</button>
+    <button>Stop updates</button>
+  </span>
+</div>
 {%- if is_logged_in() and get_active_user().can_post_to_thread_or_topic(thread) -%}
 <form action="{{url_for('threads.reply', thread_id=thread.id)}}" method="POST" class="plank post-edit-form">
   <h2 class="info">Reply to "{{thread.title}}"</h2>