Deprecate `@testing-library/preact-hooks`

[MichaelDeBoey]

Now that testing-library/preact-testing-library#56 is merged, this library can be deprecated

CC/ @testing-library/preact-hooks

[JoviDeCroock]

I don't think so, even for react they are kept around, let's not deviate too hard 😅 @testing-library/preact-hooks does a lot more as well in terms of Suspense and so on

[nickserv]

Any more opinions on this? I think we should at least add a blurb to the readme like we did for React Testing Library.

[kentcdodds]

An explanation in the README makes sense to me. If this library does more than the other, maybe those features should be added to the other so this can be deprecated.

I don't have any basis for opinion here. Just some thoughts.