Revert "Temp disable popular tags and news banner."

This reverts commit f9a44ab192.

app/logical/post_sets/post.rb

@@ -176,12 +176,10 @@ module PostSets
       end
 
       def popular_tags
-        return []
         ReportbooruService.new.popular_searches(Date.today, limit: MAX_SIDEBAR_TAGS)
       end
 
       def similar_tags
-        return []
         RelatedTagCalculator.cached_similar_tags_for_search(normalized_query(implicit: false), MAX_SIDEBAR_TAGS)
       end
 

app/views/layouts/default.html.erb

@@ -47,7 +47,7 @@
   <%= raw Danbooru.config.custom_html_header_content %>
 </head>
 <%= tag.body **body_attributes(CurrentUser.user, params, @current_item) do %>
-  <%#= render "news_updates/listing" %>
+  <%= render "news_updates/listing" %>
 
   <header id="top">
     <%= link_to Danbooru.config.app_name, root_path, id: "app-name-header", class: "heading" %>