Currently we use a CDN to distribute font assets in SaaS which means they are downloaded from another domain. This requires setting permissive CORS headers when serving them for the browsers to accept them.

To avoid unnecessary complexity in project code and handle assets serving CORS configuration at the same place where assets serving is configured (on the CDN side), we would like to stop serving CORS headers from Rails side.

To set these headers, we use `font_assets` gem which is obsolete since many years. It will simplify our project maintenance and compatibility if we remove this gem and stop supporting this function.

When using CloudFront, a possible implementation would be using functions.

We would need to document this change for customers using CDN like we are using. At the moment changing `asset_host` when deploying system is not supported. Still there might be customers that found a way to use it. If we stop serving the headers from Rails, they would need to add this functionality to their own CDN setup when upgrading.