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Expressive is a plugin that allows for players to use emotes without having to install any mods on their client.
Setup is as simple as installing the plugin and its dependencies. Expressive handles every step from setting up BetterModel to serving the resource pack on the same port as the server at /expressive/bettermodel/pack.zip.
There's almost no configuration to do apart from what emotes can be used in config.yml.
There's a bit more to be explored with Expressive but that is detailed in the docs.

A simple plugin that lets you add server-side emotes accessible by the Quick Actions hotkey