feat: add use client directive to index

[luqven]

Description

This PR adds the "use client" directive to the components index file.

Before this PR, consumer who didn't add "use client" in a file or wrapper where <Imgix> was used would see a build error in NextJs 13.

After this PR, consumers no longer see this error, and can use <Imgix>, <Picture>, and <Background> as client components, and, critically, as children of server only components.

Checklist

• Read the contributing guidelines.
• Each commit follows the Conventional Commit spec format.
• Update the readme (if applicable).
• Update or add any necessary API documentation (if applicable)
• All existing unit tests are still passing (if applicable).

[commit-lint]

Features

• add use client directive to index (97747c5)

Documentation

• update readme (c6f7068)

Contributors

luqven

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[bubble-bub]

thanks for walking me through this! lgtm~

[imgix-git-robot]

🎉 This PR is included in version 9.8.0-rc.1 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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