Remove outdated sdk

[toyamarinyon]

Source code in apps/studio.giselles.ai/packages/sdk-nextjs and apps/studio.giselles.ai/packages/sdk folders are outdated codes.

[changeset-bot]

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Latest commit: e429835

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[shige]

LGTM 👍