chore(docs): removes dead link in react-core README

[nicklemmon]

What: Closes: #12350

Removes a dead link in the react-core package README

Additional issues: N/A

Summary by CodeRabbit

• Documentation
  • Removed the "Advanced usage" section from the README.

[coderabbitai]

Walkthrough

This pull request removes the "Advanced usage" section from the React Core package README, including a reference to font application guidance. The change is documentation-only with no impact on exported code.

Changes

Cohort / File(s)	Summary
Documentation packages/react-core/README.md	Removed the "Advanced usage" section, including the bullet/link referencing "Applying Overpass font."

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: removing a dead link from the react-core README file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12337.surge.sh

A11y report: https://pf-react-pr-12337-a11y.surge.sh