Digi Accordion option for Title to be H1,H2,H3 etc

Hi Digi team,

Previously we have said that we didn't want a H4 to be used in the title of Digi Accordion macro. (Issue #2).

However, since then we have found there are occasions where it would be useful to have a title appear as a heading. But for this to be optional. So the option to make the title just paragraph text (like it is now) OR a H1,H2,H3 or H4 (to appear in the table of contents if desired).