feat: Show popular articles on widget home (#7604)

app/views/public/api/v1/models/_article.json.jbuilder

@@ -38,3 +38,5 @@ json.associated_articles do
     end
   end
 end
+
+json.link "hc/#{article.portal.slug}/articles/#{article.slug}"

app/views/widgets/show.html.erb

@@ -14,6 +14,7 @@
         welcomeTagline: '<%= @web_widget.welcome_tagline %>',
         welcomeTitle: '<%= @web_widget.welcome_title %>',
         widgetColor: '<%= @web_widget.widget_color %>',
+        portal: <%= @web_widget.inbox.portal.to_json.html_safe %>,
         enabledFeatures: <%= @web_widget.selected_feature_flags.to_json.html_safe %>,
         enabledLanguages: <%= available_locales_with_name.to_json.html_safe %>,
         replyTime: '<%= @web_widget.reply_time %>',