You could even raise funds for that! But I just don't see Ospari going anywhere - the concept is not novel in anyway and there's also a PHP based blogging platform that already dominates a lot of the internet.
Also, Ghost is open source no? I can't find any source files for Ospari...
Node.js + javascript is doing to PHP what PHP did to Pearl in some ways. I see more people pushing that in my circles now than PHP - granted there's a lot of selection bias happening.
Why not build this in Go? I'm sure plenty of people would get excited about that.
[EDIT] If the "key feature" is live previews of markdown, why not fork WordPress and build that feature into it? I'm sure a lot of people would love that - or maybe you can do it as a plugin (I don't know WordPress well enough)??
I just feel like there's a lot of "Not Invented Here" happening with your project, which can be typical of engineering minds. Please focus your talents on something truly novel!