feat: add new resources to defensive security category

[Vedashri0]

Description

This PR adds new links and resources under the defensive security category to enhance the repository's offerings in cybersecurity.

Fixes #2541

New Resources Added

• Defensive Security Handbook
• MITRE ATT&CK Framework

Checklist

• I have checked the existing issues.
• I have read the Contributing Guidelines.

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Name	Status	Preview	Comments	Updated (UTC)
linkshub	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 18, 2024 7:15am

[github-actions]

Thank you, Vedashri0, for creating this pull request and contributing to LinksHub! 💗

The maintainers will review this Pull Request and provide feedback as soon as possible! 😇
We appreciate your patience and contribution, Keep up the great work! 😀

[github-actions]

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Issue Reference

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Linting Errors

• Found type "null", must be one of "feat","fix","docs","style","refactor","perf","test","build","ci","chore","revert"
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[rupali-codes]

Hi @Vedashri0, please raise the issue and then attach the issue to this PR.

Thanks.

[rupali-codes]

Closing the PR due to inactivity.

[Vedashri0]

I have updated the PR title and description to include an issue reference and provide clarity on the changes made. Could you please review it again? Thank you!