I don't get it. It's a markdown editor, of which there are a bajillion. I don't see anything that's obviously resume specific about it besides the stuff you happened to type into it.
I'm also interested in the markdown editor. Is this something you build yourself (based on showdown) ? I also see some codemirror css in there, so it's not clear.
And actually, there is a more related discussion here[1]. Someone has built a md2resume tool 3 years ago but it is not maintained anymore. It inspired me a lot