This is great! I can barely remember my editor/IDE days before Emacs. I mean there was nano, pico, vi, vim, Gedit, and on to Eclipse, but Emacs was the only one that allowed me to work the way that I think.
I don't know much about imgix, looks like a service to add to or possibly enhance images? Demo looks neat though! I do use emacs as an asset browser for quick looks at images to verify content in web apps, but I'm not sure I'd use something like this personally.