Html template typo (#57)

fix typo in html template that makes our page not html compliant

index.html

@@ -12,7 +12,7 @@ prefix: [1,2,3,4,5,6]
     <article class="post-summary post type-post" >
 
       <header class="entry-header">
-        <a href="{{ post.url }}"" class="entry-link" title="Permanent link to “These Weeks in Firefox: Issue 25”" rel="bookmark">
+        <a href="{{ post.url }}" class="entry-link" title="Permanent link to “These Weeks in Firefox: Issue 25”" rel="bookmark">
                   <div class="post-image post-image-large">
                       <img class="wp-post-image image-fallback color-{{ prefix[0] }}" width="600" height="330" src="https://blog.nightly.mozilla.org/wp-content/themes/frontierline/img/fallbacks/pattern-{{ prefix[0] }}.png">
                     </div>