FIX: Compute topic title correctly (#29)

Was using `unicode_title` but not all topics return a unicode_title
attribute. So need to instead do this.

assets/javascripts/discourse/templates/components/docs-topic.hbs

@@ -5,7 +5,7 @@
 }}
 
 <div class="topic-content">
-  <h1>{{topic.unicode_title}}</h1>
+  <h1>{{{topic.fancyTitle}}}</h1>
   {{mount-widget
     widget="post"
     model=model