Cleanup DPU Support/Acceleration docs

[tssurya]

What would you like to see added/updated/deleted in our docs?

Write docs for https://github.com/ovn-org/ovn-kubernetes/blob/master/docs/features/hardware-offload/dpu-acceleration.md and cleanup https://github.com/ovn-org/ovn-kubernetes/blob/master/docs/features/hardware-offload/dpu-support.md by following template for features: https://github.com/ovn-org/ovn-kubernetes/blob/master/docs/features/template.md

Why is this needed?

Consistency; easiness of use for community

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[github-actions]

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