Add Mintlify preview site

[kikiya]

Summary

• Add Mintlify preview site configuration and content

Test plan

• Verify Mintlify preview site builds and renders correctly
• Check navigation merging workflow

🤖 Generated with Claude Code

[github-actions]

Files changed:

• cockroachlabs-preview-main/.github/workflows/merge-navigation.yml
• cockroachlabs-preview-main/.gitignore
• cockroachlabs-preview-main/.mintignore
• cockroachlabs-preview-main/LICENSE
• cockroachlabs-preview-main/README.md
• cockroachlabs-preview-main/VERSION_PLACEHOLDER_LINKS.md
• cockroachlabs-preview-main/docs-backup/cockroachcloud/learn-cockroachdb-sql.mdx
• cockroachlabs-preview-main/docs-backup/cockroachcloud/quickstart.mdx
• cockroachlabs-preview-main/docs-backup/releases/v25.3.mdx
• cockroachlabs-preview-main/docs-backup/stable/column-families.mdx
• cockroachlabs-preview-main/docs-backup/stable/deploy-app-netlify.mdx
• cockroachlabs-preview-main/docs-backup/stable/deploy-lambda-function.mdx
• cockroachlabs-preview-main/docs-backup/stable/developer-basics.mdx
• cockroachlabs-preview-main/docs-backup/stable/frequently-asked-questions.mdx
• cockroachlabs-preview-main/docs-backup/stable/schema-design-database.mdx
• cockroachlabs-preview-main/docs-backup/stable/schema-design-overview.mdx
• cockroachlabs-preview-main/docs-backup/v25.2/developer-basics.mdx
• cockroachlabs-preview-main/docs-backup/v25.2/hasura-getting-started.mdx
• cockroachlabs-preview-main/docs.base.json
• cockroachlabs-preview-main/docs.json
• cockroachlabs-preview-main/docs/advisories.mdx
• cockroachlabs-preview-main/docs/advisories/a101963.mdx
• cockroachlabs-preview-main/docs/advisories/a102375.mdx
• cockroachlabs-preview-main/docs/advisories/a103220.mdx
• cockroachlabs-preview-main/docs/advisories/a104309.mdx
• cockroachlabs-preview-main/docs/advisories/a106617.mdx
• cockroachlabs-preview-main/docs/advisories/a110363.mdx
• cockroachlabs-preview-main/docs/advisories/a114393.mdx
• cockroachlabs-preview-main/docs/advisories/a122372.mdx
• cockroachlabs-preview-main/docs/advisories/a123371.mdx
• cockroachlabs-preview-main/docs/advisories/a131639.mdx
• cockroachlabs-preview-main/docs/advisories/a131639_check.sh
• cockroachlabs-preview-main/docs/advisories/a133479.mdx
• cockroachlabs-preview-main/docs/advisories/a144650.mdx
• cockroachlabs-preview-main/docs/advisories/a151050.mdx
• cockroachlabs-preview-main/docs/advisories/a161317.mdx
• cockroachlabs-preview-main/docs/advisories/a162085.mdx
• cockroachlabs-preview-main/docs/advisories/a190483.mdx
• cockroachlabs-preview-main/docs/advisories/a30821.mdx
• cockroachlabs-preview-main/docs/advisories/a42567.mdx
• cockroachlabs-preview-main/docs/advisories/a43870.mdx
• cockroachlabs-preview-main/docs/advisories/a44166.mdx
• cockroachlabs-preview-main/docs/advisories/a44299.mdx
• cockroachlabs-preview-main/docs/advisories/a44348.mdx
• cockroachlabs-preview-main/docs/advisories/a48860.mdx
• cockroachlabs-preview-main/docs/advisories/a50587.mdx
• cockroachlabs-preview-main/docs/advisories/a54418.mdx
• cockroachlabs-preview-main/docs/advisories/a56116.mdx
• cockroachlabs-preview-main/docs/advisories/a58932.mdx
• cockroachlabs-preview-main/docs/advisories/a62842.mdx
• cockroachlabs-preview-main/docs/advisories/a63162.mdx
• cockroachlabs-preview-main/docs/advisories/a64325.mdx
• cockroachlabs-preview-main/docs/advisories/a68005.mdx
• cockroachlabs-preview-main/docs/advisories/a69874.mdx
• cockroachlabs-preview-main/docs/advisories/a71002.mdx
• cockroachlabs-preview-main/docs/advisories/a71553.mdx
• cockroachlabs-preview-main/docs/advisories/a71655.mdx
• cockroachlabs-preview-main/docs/advisories/a72839.mdx
• cockroachlabs-preview-main/docs/advisories/a73024.mdx
• cockroachlabs-preview-main/docs/advisories/a73629.mdx
• cockroachlabs-preview-main/docs/advisories/a74385.mdx
• cockroachlabs-preview-main/docs/advisories/a74736.mdx
• cockroachlabs-preview-main/docs/advisories/a75758.mdx
• cockroachlabs-preview-main/docs/advisories/a76522.mdx
• cockroachlabs-preview-main/docs/advisories/a78681.mdx
• cockroachlabs-preview-main/docs/advisories/a79066.mdx
• cockroachlabs-preview-main/docs/advisories/a79281.mdx
• cockroachlabs-preview-main/docs/advisories/a79384.mdx
• cockroachlabs-preview-main/docs/advisories/a81315.mdx
• cockroachlabs-preview-main/docs/advisories/a81448.mdx
• cockroachlabs-preview-main/docs/advisories/a81968.mdx
• cockroachlabs-preview-main/docs/advisories/a82079.mdx
• cockroachlabs-preview-main/docs/advisories/a82309.mdx
• cockroachlabs-preview-main/docs/advisories/a82576.mdx
• cockroachlabs-preview-main/docs/advisories/a84144.mdx
• cockroachlabs-preview-main/docs/advisories/a88042.mdx
• cockroachlabs-preview-main/docs/advisories/a88407.mdx
• cockroachlabs-preview-main/docs/advisories/a88993.mdx
• cockroachlabs-preview-main/docs/advisories/a90146.mdx
• cockroachlabs-preview-main/docs/advisories/a93314.mdx
• cockroachlabs-preview-main/docs/advisories/a93398.mdx
• cockroachlabs-preview-main/docs/advisories/a96029.mdx
• cockroachlabs-preview-main/docs/advisories/a96465.mdx
• cockroachlabs-preview-main/docs/advisories/a96924.mdx
• cockroachlabs-preview-main/docs/advisories/a97090.mdx
• cockroachlabs-preview-main/docs/advisories/a97178.mdx
• cockroachlabs-preview-main/docs/advisories/a97932.mdx
• cockroachlabs-preview-main/docs/advisories/a98779.mdx
• cockroachlabs-preview-main/docs/advisories/a99049.mdx
• cockroachlabs-preview-main/docs/advisories/a99561.mdx
• cockroachlabs-preview-main/docs/advisories/a99796.mdx
• cockroachlabs-preview-main/docs/advisories/acve-2021-44228.mdx
• cockroachlabs-preview-main/docs/advisories/c20230118.mdx
• cockroachlabs-preview-main/docs/advisories/detect_144650.sh
• cockroachlabs-preview-main/docs/cockroachcloud/advanced-cluster-management.mdx
• cockroachlabs-preview-main/docs/cockroachcloud/alerts-page.mdx
• cockroachlabs-preview-main/docs/cockroachcloud/authentication.mdx
• cockroachlabs-preview-main/docs/cockroachcloud/authorization.mdx
• cockroachlabs-preview-main/docs/cockroachcloud/aws-privatelink.mdx
• cockroachlabs-preview-main/docs/cockroachcloud/backup-and-restore-monitoring.mdx