docs(pie-docs): DSW-2224 checkbox group overview page

[dandel10n]

Describe your changes (can list changeset entries if preferable)

---

"pie-docs": minor

[Added] - PIE Checkbox Group Component overview page

Figma design: open
Alternative text: open
Image assets: open
Feature url: https://pr1638-docs.pie.design/components/checkbox-group/

Author Checklist (complete before requesting a review)

• I have performed a self-review of my code
• I have reviewed the Docs site preview
• If there are visual test updates, I have reviewed them properly before approving

Reviewer checklists (complete before approving)

Reviewer 1

• I have reviewed the Docs site preview
• If new links have been added, I have tested them in the preview
• If there are visual test updates, I have reviewed them

Reviewer 2

• I have reviewed the Docs site preview
• If new links have been added, I have tested them in the preview
• If there are visual test updates, I have reviewed them

[changeset-bot]

🦋 Changeset detected

Latest commit: 2983505

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

This PR includes changesets to release 1 package

Name	Type
pie-docs	Minor

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[pie-design-system-bot]

	Fails
🚫	You currently have an unchecked checklist item in your PR description. Please confirm this check has been carried out – if it's not relevant to your PR, delete this line from the PR checklist.

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