This is a subject I am interested in, so I began your article eagerly, but had to stop about halfway through out of frustration. Please consider these as the constructive suggestions that I intend them to be:
Think about the story you want to tell. Maybe make an outline or diagram, marking at which points you will introduce which facts.
Example: For some reason something called Commonmark is abruptly mentioned, with a link to spec documents that would seem to be of only technical interest. What is this, and how is it connected to anything else?
Do enough research so that you know the highest peaks in the landscape. Why describe the foothills and take no notice of the prominent mountaintop right in front of us?
Example: the bits about the comics were fascinating. But where is Pandoc? I don’t think I’m guilty, here, of demanding that you write the article I would have written. But Pandoc is the application of Markdown. It turns Markdown into a way to author HTML, TeX, PDF, Office formats, and a lot more. It‘s huge.
Anyway, I like the look of your site (but agree with others that you should not hijack browser shortcuts).