Emoji selector and custom Emoji

[fantasticfears (Erick Guan)]

@zogstrip

Added a howto:

Configure custom emoji

This guide explains how to customize emojis on your Discourse site through selectable emoji sets, uploading new emoji, configuring site settings, and adjusting emoji sizes. Required user level: Administrator Selecting an emoji set Discourse currently supports five emoji sets: Fluent UI Noto OpenMoji Twemoji Standard (Unicode) For an overview on how the different sets look, you can take a look at this emoji set comparison. You can configure the emoji_set s…