feat: Backend changes for article and categories ordering (#6655)

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

@@ -4,6 +4,7 @@ json.title article.title
 json.content article.content
 json.description article.description
 json.status article.status
+json.position article.position
 json.account_id article.account_id
 json.last_updated_at article.updated_at