Mark packages as deprecated and point to coral-xyz versions?

[mikemaccana]

Using borsch as an example: there's quite a few downloads of the project-serum package but there's been no updates in quite a white, and project serum seems to have been replaced by openbook.

The coral equivalent is still actively maintained and popular.

The openbook equivalent is still actively maintained but few people are using it.

If the Serum packages are no longer maintained, they should be marked as deprecated

See https://docs.npmjs.com/deprecating-and-undeprecating-packages-or-package-versions. For example:

npm deprecate @project-serum/borsh "This package is no longer actively maintained. Please use @coral-xyz/borsh instead"