Display the current recommended release for some versions on the website.

[eerussianguy]

So I often find myself wanting to update my parchment install or add it to a project, but it's a little bit hard if you're not in discord to find what version to use. Some sort of string that can update regularly (or even show up on this repo) would make things a little faster. I've always liked how PYPI projects generate a little install string to display on the website in large letters, so you always have the thing you need first before anything else. If it could say something like mappings channel="parchment", version="xyz" that would be wonderful.