fix: Prevent Reverse Tabnabbing in Footer

[gowthamrdyy]

Closes #1855

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[Copilot]

Pull request overview

Note

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This PR improves security best practices for external links in the footer by updating rel attributes on anchor tags that open in a new tab.

Changes:

• Replace rel="noreferrer" with rel="noopener noreferrer" for external links using target="_blank".

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[github-actions]

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