I found this information somwhere on the interwebs. I wanted to get Jekyll to parse Markdown similar to the format used in Github Flavored Markdown. So I went a-googling. Here is the bits you need to add to your
_config.yml to get GFM.
# Make redcarpet behave like GitHub Flavored Markdown redcarpet: extensions: ["no_intra_emphasis", "fenced_code_blocks", "autolink", "strikethrough", "superscript", "with_toc_data"]
with_toc_data option is supposed to provide those permalinked page headings we all seem to be using these days as well as a Table of Contents. However it falls a bit flat on how it identifies each heading.