🎨 Palette: Visually indicate superseded package

[google-labs-jules]

💡 What: Added a strikethrough to the phssensitivitylabels R package link in the README.

🎯 Why: The README notes that this package's functionality was merged into the phstemplates package. The strikethrough provides a clear, immediate visual cue that the package is superseded or archived, improving clarity for anyone scanning the user's projects.

♿ Accessibility: This change uses standard Markdown and does not negatively impact accessibility. The text remains readable by screen readers.

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PR created automatically by Jules for task 16442841002202429505 started by @Moohan

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