Use stars icon on explore->starred page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/explore/projects/_project.html.haml

@@ -6,6 +6,7 @@
 
     - if current_page?(starred_explore_projects_path)
       %strong.pull-right
+        %i.fa.fa-star
         = pluralize project.star_count, 'star'
 
   .project-info

app/views/explore/projects/starred.html.haml

 .explore-trending-block
   %p.lead
-    %i.fa.fa-comments-o
+    %i.fa.fa-star
     See most starred projects
   %hr
   .public-projects