Reuse credential options across V2 docs

[coderdan]

Summary

• reuse the CipherStash credentials component in deployment, workspace, Drizzle, and Supabase guidance
• clarify the Edge Functions exception and use named credentials written to the local env file
• route migration, Proxy, quickstart, and overview pages to the shared credential guidance
• replace remaining legacy production-guide links in the touched pages

Validation

• bun run validate-content
• bun run validate-links
• bun run types:check
• bun run lint
• next build
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
public-docs	Ready	Preview	Jul 30, 2026 11:30am