Create adapters for Emoji #61
Description
We currently have an Emoji plugin defined, but we have no adapter for it. We should translate it to:
- Fallback for platform with no emoji. Self-explanatory, just use the fallback property instead.
- Markdown. There's a few remark plugins for emojis, but none for custom ones. Easy enough to translate if we keep it as
:emoji:(could start there), harder if we want to provide a reference to the set that originated it. The mdast specification could give a few ideas. - Rich Text Facet. Bluemoji has its own RichText Facet. We've never made one of our own before, but why not try?