docs: function moveArticle(summary, origin, target) {
      // Coerce to level
      var originLevel = is.string(origin)? origin : origin.getLevel();
      var targetLevel = is.string(target)? target : target.getLevel();
      var article = summary.getByLevel(originLevel);
  
      // Remove first
      var removed = removeArticle(summary, originLevel);
      return insertArticle(removed, article, targetLevel);
  }