Update Rollup Recipe

[waynevanson]

Hi All,

It's recommended by rollup to use @rollup/stream instead of rollup-stream.

The following recipe is outdated. Solution is to advise users to redirect themselves to @rollup/stream readme.md or write a recipe similar to what they've written.

I've spent 4 days writing a gulp stream for rollup because I didn't know rollup had their own stream implementation, unlucky.

[rootwork]

@waynevanson I think this is more than an idea, this is a documentation bug. I know documentation in general is in flux and being reviewed (#2164), but maybe worth opening a PR for this quick fix?

[phated]

@waynevanson PR #2503 was attempting to do this but the author had other stuff come up and didn't finish it. Happy to review any adjustments.