Converts github/gemoji#303 (https://raw.githubusercontent.com/github/gemoji/537ff2d7e0496e9964824f7f73ec7ece88c9765a/db/emoji.json)

Modifications made to input.json

Added united_kingdom shortcode. Removed israel Add extra flag shortcodes (flag_gb, flag_ps, etc...)

Used in:

https://github.com/Nerimity/nerimity-web/tree/main/src/emoji

Using fork twemoji: https://github.com/Nerimity/twemoji