chore: Remove static URLs from the documentation (#5461)

app/views/api/v1/accounts/articles/_article.json.jbuilder

@@ -9,6 +9,7 @@ json.meta article.meta
 json.category do
   json.id article.category_id
   json.name article.category.name
+  json.slug article.category.slug
 end
 
 if article.portal.present?

app/views/layouts/vueapp.html.erb

@@ -33,6 +33,7 @@
     <script>
       window.chatwootConfig = {
         hostURL: '<%= ENV.fetch('FRONTEND_URL', '') %>',
+        helpCenterURL: '<%= ENV.fetch('HELPCENTER_URL', '') %>',
         fbAppId: '<%= ENV.fetch('FB_APP_ID', nil) %>',
         fbApiVersion: '<%= @global_config['FACEBOOK_API_VERSION'] %>',
         signupEnabled: '<%= @global_config['ENABLE_ACCOUNT_SIGNUP'] %>',