HTML Preview for Org Files

I've long been a fan of Brett Terpstra's Marked for easily reading Markdown files. Over the years, he's added more and more features. He's recently released Marked 3 which, if you need those features, is well worth the purchase price of $2.99/month subscription or a one-time purchase of $69.99. There are only two small things keeping me from upgrading: I don't need any of those features — in fact,…