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 README, advising users to migrate to the new Auro Formkit.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a deprecation warning to the README.md file of the component. The warning informs users that the component is deprecated and no longer supported, and provides a link to the new Auro Formkit for users to migrate to.

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 README.md file.	Added a deprecation warning to the README.md file, informing users that the component is deprecated and no longer supported. Provided a link to the new Auro Formkit for users to migrate to.	README.md

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[github-actions]

Surge demo deployment failed! 😭

[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: Please add a timeline for removal.

Adding a specific date or version number for when this component will be removed will help users plan their migration.

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.
	> **Timeline:** This component will be removed in version 3.0.0, effective December 31, 2023.