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 combobox component as deprecated.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a deprecation warning to the combobox component in the README.md file. The warning informs users that the component is deprecated and suggests migrating 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 combobox component.	Added a deprecation warning to the combobox section of the README. The warning suggests 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 go into effect.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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