docs: added Hardening Guide

[sushant-suse]

Which issue(s) this PR fixes:

Issue 11672

What this PR does / why we need it:

Adds Hardening guide.

Special notes for your reviewer:

N/A

Additional documentation or context:

N/A

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[derekbit]

Please add mTLS for the security communication for Longhorn pods.
https://longhorn.io/docs/1.11.0/advanced-resources/security/mtls-support/

[sushant-suse]

Please add mTLS for the security communication for Longhorn pods. https://longhorn.io/docs/1.11.0/advanced-resources/security/mtls-support/

As a reference in the References Section?

[derekbit]

Please add mTLS for the security communication for Longhorn pods. longhorn.io/docs/1.11.0/advanced-resources/security/mtls-support

As a reference in the References Section?

Need to add a section for mTLS in the doc.

[derekbit]

Please add the references in each section

[derekbit]

IMO, we should refine the documentation since some information and steps are already covered in the official docs. Rather than copying and pasting redundant content, we should focus on providing clearer explanations and adding appropriate references. Additionally, if any content is provides by LLM, please ensure it is carefully validated.

[sushant-suse]

IMO, we should refine the documentation since some information and steps are already covered in the official docs. Rather than copying and pasting redundant content, we should focus on providing clearer explanations and adding appropriate references. Additionally, if any content is provides by LLM, please ensure it is carefully validated.

Thank you for the feedback regarding redundancy and documentation focus. I completely agree that this guide should complement, rather than duplicate, the official documentation. My goal in including specific technical context was to provide a 'single-pane-of-glass' experience for users in restricted environments who require immediate justification for security controls during compliance audits. However, I recognize the importance of keeping the guide lean and referential. Let me refactor the document to remove redundant step-by-step instructions.