Bug - Remove dead link in the react-core package README

[tlabaj]

Describe the problem
Remove dead link in the react-core package README

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Jira Issue: PF-3990

[coderabbitai]

🔗 Related PRs

#12185 - Fixed readme. [merged]

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.