Update README.md with migration WARNING

[lpiwowar]

Add WARNING to README.md about migration to lightspeed-stack.

Summary by CodeRabbit

• Documentation
  • Added migration notice to README informing users of upcoming deployment changes and directing them to the migration tracking branch.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f023649d-c5c1-4779-ac59-f899b5afe17c

📥 Commits

Reviewing files that changed from the base of the PR and between f68c365 and 75537d5.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md file was updated with a warning block notifying readers about an ongoing migration to the lightspeed-stack-based deployment model, with a reference to the lcore-migration branch for additional details.

Changes

Cohort / File(s)	Summary
Documentation Update README.md	Added a prominent warning block about migration to lightspeed-stack-based deployment and directed readers to the lcore-migration branch for tracking progress.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰✨ A notice hops into README's page,
Of journeys new and brighter stage,
The lightspeed-stack awaits ahead—
Migration whispers, clearly spread!
Follow lcore-migration's trail,
And watch our operator set sail! 🚀

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Update README.md with migration WARNING' clearly and accurately summarizes the main change: adding a migration warning to the README.md file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Akrog]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Akrog, lpiwowar

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• OWNERS [Akrog,lpiwowar]

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