docs: add telemetry opt-out to installation

[Keredu]

Summary

• add the clerk telemetry disable command immediately after the Clerk CLI installation instructions
• keep the detailed telemetry section unchanged

Validation

• git diff --check
• Not run: Bun checks (Bun is unavailable in this environment; this is a README-only change)

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Latest commit: d2aee48

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[coderabbitai]

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Reviewing files that changed from the base of the PR and between dbf4937 and d2aee48.

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• README.md

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📝 Walkthrough

Walkthrough

The README npm installation section now includes the clerk telemetry disable command for opting out of telemetry after installing the Clerk CLI.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: rafa-thayto

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