docs: add quick start guide to verify HAMi in Kubernetes

[mesutoezdil]

This PR adds a practical quick start guide to verify HAMi in a real Kubernetes environment.

Key improvements:

• Adds a strict pre-flight GPU validation step
• Ensures users verify GPU functionality before installing HAMi
• Uses copy-paste friendly commands (cat <<EOF)
• Includes clear expected outcomes for each step
• Reduces confusion between successful deployment and actual runtime behavior

The goal is to help users quickly confirm that HAMi works correctly, not just that it is installed.

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[hami-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mesutoezdil
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[hami-robot]

Welcome @mesutoezdil! It looks like this is your first PR to Project-HAMi/website 🎉

[mesutoezdil]

Happy to adjust or simplify if needed @rootsongjc, @archlitchi!

[rootsongjc]

@mesutoezdil How about covert it into a blog? Because it is so solid and long to be a quick start doc. And I think if there is a diagrm it will be better.