[DX-807] Update AIT image in docs overview

[matt423]

Description

Update the image on the AIT overview page per design request

Review App

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dx-807-update-ait-image

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