Just a little something I have found useful... Rather than using a plugin to provide Markdown previews when editing documentation in Vim, Grip is a great little tool to display previews while cutting out the middle man and keeping Vim light. Grip is available in Debian's apt repositories, simply install with: sudo apt install grip
You can then view your preview by running grip [path] [port] or grip some/path/README.md 1234
Then simply go to localhost:port (or localhost:1234) in your web browser to view the preview.
