docs(security): defer to org-wide default security policy

[aprojic]

Removes the repo-local SECURITY.md so the organization-wide default policy (daytona/.github) applies. Part of consolidating the security policy into a single canonical file.

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Summary by cubic

Adopts the organization-wide security policy by removing the repo-local SECURITY.md. Previously this repo defined its own policy; now GitHub applies the policy from daytona/.github, reducing duplication and drift.

• Review and rollout
  • Confirm the repo inherits the org policy: Settings → Security → “View security policy” should point to daytona/.github/SECURITY.md.
  • Update any docs or README links that referenced this repo’s SECURITY.md to the org policy.
  • No runtime/build changes; reporting routes follow the org policy.

^{Written for commit 97f9934. Summary will update on new commits.}

[github-actions]

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[cubic-dev-ai]

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[aprojic]

I have read the CLA Document and I hereby sign the CLA