The page load is pretty junky due to FOUC. But that's probably fixable. I like this approach a lot.

https://en.wikipedia.org/wiki/Flash_of_unstyled_content

Markdeep seems great!

Having modifiable source inside the html is a great idea. I'll still need to have a compile workflow to add image while keeping a standalone produced html file (and some other feature such as live-preview), but I'll definitely add this as a possible workflow.