Add deprecation notice to README

[AntTheLimey]

Summary

• Adds a deprecation notice to the top of the README indicating the CLI is no longer actively developed and ARM support has been discontinued
• Lists recommended migration alternatives: Control Plane, Ansible, and Enterprise Packages

Test plan

• Verify the [!IMPORTANT] callout renders correctly on GitHub
• Confirm all three migration links resolve to valid docs pages

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 72909ecd-1251-4273-a037-5230d1d30398

📥 Commits

Reviewing files that changed from the base of the PR and between 6de3078 and acaf78d.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README is updated with a deprecation notice at the top, indicating that ARM support has been discontinued, maintenance releases continue for x86 only, and recommending three migration alternatives with links to pgEdge Control Plane, Ansible, and Enterprise Packages.

Changes

Deprecation Notice

Layer / File(s)	Summary
Deprecation Notice README.md	A prominent "IMPORTANT" block is added to the top of the README stating discontinued ARM support, x86-only maintenance releases, and migration recommendations with links to three pgEdge alternatives.

Poem

🐰 The times they are a-changin', dear friend,
ARM's road comes to its end,
But fear not—x86 holds the fort,
With pgEdge paths of every sort,
New homes await, so hop along! 🐾

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the main change: adding a deprecation notice to the README file.
Description check	✅ Passed	The description is directly related to the changeset, providing context about the deprecation notice and listing the migration alternatives mentioned in the changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codacy-production]

Up to standards ✅

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