Cache bust the article's path and add minor improvement for banishing (#3492)

app/labor/cache_buster.rb

@@ -42,6 +42,7 @@ class CacheBuster
 
   def bust_article(article)
     bust("/" + article.user.username)
+    bust(article.path)
     bust(article.path + "/")
     bust(article.path + "?i=i")
     bust(article.path + "/?i=i")

app/services/moderator/manage_activity_and_roles.rb

@@ -38,6 +38,7 @@ module Moderator
         end
         article.remove_algolia_index
         article.delete
+        article.purge
       end
       virtual_articles.each do |article|
         cachebuster.bust_article(article)