Replace :+1: with 👍

[Gummibeer]

After HTML parsing I think that it would be nice to not only replace native emojis but also the common colon emoji-name variants.
I think that the biggest challenge would be getting the list. The spatie/emoji we already use in dev dependencies could provide a good starting point with official names. But a lot of these emojis also have aliases like :+1: and flags also have a shorter name, like :flag-de: or even just :de:.