How to Add GitHub Flavored Markdown Export to Emacs
I use Doom Emacs. In order to add Github Flavored Markdown (gfm) instead of the default markdown export open packages.el in your Doom Emacs and add (package! ox-gfm).
Then after reloading Doom run M-x org-pandoc-export-to-gfm to export the current org file open in the Emacs buffer to a gfm file