DEPRECATION: add deprecation warning to this package

[DukeFerdinand]

Resolves AlaskaAirlines/auro-formkit#394, adding deprecation warning to old form element repositories.

Summary by Sourcery

Documentation:

• Adds a deprecation warning to the Datepicker component's README.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a deprecation warning to the Datepicker component in the README, advising users to migrate to the new Auro Formkit.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added a deprecation warning to the Datepicker component.	Added a warning message indicating the component is deprecated and users should migrate to Auro Formkit.	README.md

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[sourcery-ai]

Hey @DukeFerdinand - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a link to the specific component within Auro Formkit that replaces this one.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

suggestion: Suggest adding a link to the migration guide.

Adding a link to the migration guide within the deprecation notice would improve the user experience by providing direct access to the necessary information for transitioning to Auro Formkit. A short sentence like "See the migration guide for more details" would suffice.

Suggested change

	> **WARNING:** This component is deprecated and is no longer supported. Please migrate to the new [Auro Formkit](https://github.com/AlaskaAirlines/auro-formkit) instead.
	> **WARNING:** This component is deprecated and is no longer supported. Please migrate to the new [Auro Formkit](https://github.com/AlaskaAirlines/auro-formkit) instead.
	>
	> See the [migration guide](https://github.com/AlaskaAirlines/auro-formkit/blob/main/MIGRATION_GUIDE.md) for more details.

[github-actions]

Surge demo deployment failed! 😭