Very nice!

I've been using mdserve. A nice feature is a sidebar that lists all the MD files in a directory. I wish it could also list sub-directories.

The reason is because I organize related MD files in directories, with sub-directories. Folders without MD files should be filtered out.

Here is an example project with MD files in both reference and specs (and root) folders. Other folders should be filtered out: https://github.com/Leftium/rift-transcription

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The brew install did not work; the App source name is wrong: `Error: It seems the App source '/opt/homebrew/Caskroom/markdown-prism/0.2.0/Markdown Prism.app' is not there.`