[UI] emoji.js ToDo List

[6543]

list what come up in #8950, #8886, ...

ToDo's

• Upgrade to latest fork (hackmdio/emojify.js since joypixels/emojify.js is archived)

Bug's

• emoji dont work in markdown list ([BUG] [UI] emoji dont work in markdown list #8953)

Enhancements

• utf8 emoji's (option to use UTF-8 emoji's hackmdio/emojify.js#21)
• optional use of CDN for emoji's
• custom skin color ? ([Feature] Add Gitea Emoji #8950 (comment))