Add ability to disable svelte-package publishing instructions

[silverbucket]

Describe the problem

I'm working on a shared component library to use with a number of different projects. The release process of this library needs to be different than a simple npm publish of the package directory. So the message displayed is incorrect and causes confusion among developers.

Describe the proposed solution

Add ability to remove the publishing instructions, (i.e. -s silent mode)

Though it's nice to have the basic text:

$ npx svelte-package
src/lib -> package
Successfully built 'shared-svelte-components' package.

It's this part after, that can go against any custom workflow:

To publish it to npm:
  cd package
  npm publish

In my case we need to actually commit and tag the release in git and install via a git URL so this instruction is entirely incorrect for us (and potentially dangerous).

Ideally it would be even better have the option to have the package.json that is generated set to private by default.

Alternatives considered

No response

Importance

would make my life easier

Additional Information

No response