docs: add reading order for the security model to GETTING_STARTED.md

[AaliyaKhan25]

Summary

Checklist

• The issue this closes was assigned to me (see CONTRIBUTING.md)
• This is my only open PR (one issue at a time, see CONTRIBUTING.md)
• Target branch is dev (see BRANCHING.md)
• cd sdk && make check-ci passes locally
• New code has tests (every module gets a test file)
• Public API changes are reflected in sdk/README.md / sdk/docs/
• No secrets, internal URLs, or private paths in the diff
• If a model wrote a meaningful part of this, I said so below (AI_POLICY.md)

Notes for reviewers

[greptile-apps]

Greptile Summary

Adds a dedicated reading order for understanding Unplug’s security model while retaining the existing integration, SDK reference, and deployment links.

• Introduces an ordered six-document security-model guide.
• Separates conceptual security documentation from task-oriented next steps.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
sdk/docs/GETTING_STARTED.md	Adds a coherent security-model reading sequence whose relative links resolve and whose descriptions match the referenced documents.

_{Reviews (2): Last reviewed commit: "docs: restore integrations/deployment ta..." | Re-trigger Greptile}

[chiruu12]

Ordering is right and all six targets resolve.

It drops four links though. integrations/custom-loop/README.md, integrations/README.md, sdk/README.md and DEPLOYMENT.md appeared only in the table you replaced, so after this the getting-started page has no route to the integrations or to deployment at all.

Keep them, in a second short table under the new one.

[AaliyaKhan25]

Fixed — restored the integrations/deployment table separately, kept the security-model table below it as its own table.