Revert "FEATURE: Use configured quotation marks in fancy topic title"

This reverts most of commit ce8e099639.

The rake task to update fancy topic titles is still there, because that's useful even without this feature.

lib/html_prettify.rb

@@ -10,8 +10,8 @@
 #
 
 class HtmlPrettify < String
-  def self.render(html, entities = {})
-    new(html, [2], entities).to_html
+  def self.render(html)
+    new(html).to_html
   end
 
   # Create a new RubyPants instance with the text in +string+.