this guide doesn't use any fancy-unicodes...
I'm guessing that :penguin: isn't a unicode-penguin character, but some emoji supported natively by github
(e.g. :+1: means thumbs-up, but that's native to github / shows as :+1: to non-emoji-supported cli/browser/etc.)
(e.g. :+1: means thumbs-up, but that's native to github / shows as :+1: to non-emoji-supported cli/browser/etc.)