DEPRECATION: add deprecation warning to this package

[DukeFerdinand]

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

Summary by Sourcery

Chores:

• Marks the package as deprecated.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a deprecation warning to the README file of the old form element repositories, recommending migration 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 README file.	Added a deprecation warning to the Checkbox section. Recommended migrating to the new Auro Formkit.	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 date for when the deprecation will take effect.

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]

issue (typo): Typo: "Auro Formkit" should be "auro-formkit"

The project name is "auro-formkit" (lowercase with a hyphen), as seen in the GitHub repository. The documentation should match this.

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.