Add redirect from /docs/security-compliance to external security page

[devin-ai-integration]

Summary

Adds a redirect from /docs/security-compliance to https://www.assemblyai.com/security (the external Security at AssemblyAI page) in the Fern docs configuration.

Review & Testing Checklist for Human

• After deployment, test that visiting https://www.assemblyai.com/docs/security-compliance correctly redirects to https://www.assemblyai.com/security
• Verify there are no internal links pointing to /docs/security-compliance that should be updated to point directly to the external URL

Notes

Requested by @MAsuamah (michelle@assemblyai.com)

Link to Devin run: https://app.devin.ai/sessions/bca317d3568d4a27ab96796bd81cddd9

[devin-ai-integration]

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