Removing all \n is incorrect as these are used to show linebreaks in the html...

Removing all \n is incorrect as these are used to show linebreaks in the html formatted body. Instead use the CMARK_OPT_HARDBREAKS options so these softbreaks in the markdown string are converted to hard breaks <br/> in the html.

Also remove 2 step process to replace <!-- raw HTML omitted --> and straight replace with "" to ensure no real breaks are removed