Docs: Installing new/custom pleroma-fe lists old way
The problem with this way is that you'll overwrite files like your tos and other things you may have changed.
There's a front-end management system now that can be used. See https://docs-develop.pleroma.social/backend/configuration/cheatsheet/#frontend-management
Pleroma will first fetch files from static_dir, then from the frontends folder, then from priv. That way you can safely drop in a new fe without overwriting files like tos. It's also possible to keep different fe's next to each other and easily switch between them (e.g. to test a feature for a while, but then you want to easily switch back later).
Docs should note this new way of installing fe's