docs(changeset): document clerk deploy production wizard

Author: wyattjoh

.changeset/deploy-wizard.md

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+---
+"clerk": minor
+---
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+Add `clerk deploy`, an interactive wizard that promotes a Clerk application from development to production.
+
+- Walks through cloning the development instance, creating the production instance, and configuring CNAME records.
+- Verifies mail, DNS, and SSL one component at a time so each step's status is visible while polling.
+- Optionally exports the DNS records as a BIND zone file at `./clerk-<domain>.zone` for import into providers like Cloudflare, Route 53, and Google Cloud DNS.
+- Resumes from the next pending step on subsequent runs, including reshowing the CNAME records when DNS is not yet verified.
+- Collects production OAuth credentials for any social providers enabled in development.