There are many existing markdown rendering plugins in the Neovim ecosystem. However, most of these rely on syncing a separate browser window with the buffer. This is the correct way to do things to get full feature support, however I wanted something that worked completely inside of Neovim and made things look slightly "nicer".
The closest one I found to this was headlines.nvim, which is an awesome plugin that I took several ideas from. However it just didn't have quite what I was looking for. In particular I wanted something that would disappear completely when editing a file and quickly render some style when viewing the file. Hence this plugin.