figured out a way to embed masto / gotosocial custom emoji in any #jekyll page!
- download the custom_emojis.json for your instance (on GTS this currently requires a token with admin read scope) https://docs.joinmastodon.org/methods/custom_emojis/
- use a script to download the images locally to their shortcodes, here's one i wrote in ruby: https://miyaku.media/downloads/masto-emojis-dl.rb
- install emoji_for_jekyll and point emoji-images-path at the emojis you just downloaded: https://github.com/yihangho/emoji-for-jekyll (won't work with github pages auto-building sites, maybe you can figure out getting jemoji to work with this instead)
- now you can use emoji :shortcodes: anywhere in your jekyll site or blog and they'll get turned into images with an .emoji CSS class!