FIX: ensure emojis have absolute URLs and uses CDN

lib/url_helper.rb

@@ -3,8 +3,7 @@ class UrlHelper
   def self.is_local(url)
     url.present? && (
       Discourse.store.has_been_uploaded?(url) ||
-      !!(url =~ /^\/assets\//) ||
-      !!(url =~ /^\/plugins\//) ||
+      !!(url =~ /^\/(assets|plugins|images)\//) ||
       url.start_with?(Discourse.asset_host || Discourse.base_url_no_prefix)
     )
   end