is value will be ignored
            * ordered      (bool)   : false  - when set to true, an ordered list will be outputted instead of an unordered list
            * item_class   (string) :   ''   - add custom class(es) for each list item; has support for '%level%' placeholder, which is the current heading level
            * baseurl      (string) :   ''   - add a base url to the TOC links for when your TOC is on another page than the actual content
            * anchor_class (string) :   ''   - add custom