Today, in a very round-about way, one could use a livebook as if it were a blog post: download-install Livebook on your machive, download the blog post livemd file, run it locally.

Here's an example. Note in the first paragraph a link to the post as a livemd file: https://genericjam.com/blog/image-processing

If you go through the steps, you'll notice that the livemd isn't stylized as a blog post. This is where the next opportunity lies: creating beautiful blog posts as livebooks, and without the need to install and run a livebook server locally.