Move packages-next to packages

[JedWatson]

Been meaning to do this since we got rid of the last legacy packages and removed the original packages directory.

This moves packages-next to packages and updates all the references.

I also found a few things we missed (old config in package.json etc) for things that have been removed, and cleaned it up.

[changeset-bot]

🦋 Changeset detected

Latest commit: 0333f13

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 15 packages

Name	Type
@keystone-next/website	Patch
@keystone-next/example-auth	Patch
@keystone-next/example-custom-field	Patch
@keystone-next/admin-ui-utils	Patch
@keystone-next/auth	Patch
@keystone-next/cloudinary	Patch
@keystone-next/document-renderer	Patch
@keystone-next/fields	Patch
@keystone-next/fields-document	Patch
@keystone-next/keystone	Patch
@keystone-next/session-store-redis	Patch
@keystone-next/testing	Patch
@keystone-next/types	Patch
@keystone-next/utils	Patch
@keystone-next/api-tests-legacy	Patch

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[timleslie]

Requires a changeset

[JedWatson]

@timleslie

Requires a changeset

What were you expecting this to include?

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[timleslie]

👍