Update package links

[cgarnier]

Update the package links to fix https://www.npmjs.com/package/@apollo/sandbox links.

[apollo-cla]

@cgarnier: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[changeset-bot]

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Latest commit: 41cf91a

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[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit 41cf91a:

Sandbox	Source
npm-embeddable-explorer (forked)	Configuration
npm-embeddable-sandbox	Configuration
maya-test-embed-next	Configuration
maya-test-embed-next	Configuration