Nice! Looks just like a little project I built out a couple days ago - http://mrkdwn.pro

Same thing, you can feed it a url at mrkdwn.pro/#/?url=

I like how you expose theming, that's cool. I got my domain for 88 cents on Namecheap - just fyi in case you want a slick little domain for super cheap. They have .press, .pro, etc for 88 cents.

Markdown FTW!