Improve custom domain and quickstart documentation

[mintlify]

Summary

This update refines the custom domain setup guide and enhances the quickstart guide for clarity and ease of use.

Changes

• Updated image display for custom domain setup to ensure correct theme-based rendering.
• Added a new card component to the custom domain guide.
• Changed the "Before you begin" section heading to "Start here" in the quickstart guide.
• Standardized keyword formatting in the quickstart guide's frontmatter.

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Note

Low Risk
Low risk documentation-only updates; main risk is minor rendering/navigation changes from swapped dark/light image classes and renamed page titles.

Overview
Updates documentation content and presentation across several MDX pages.

In customize/custom-domain.mdx and quickstart.mdx, adjusts theme-specific image rendering by swapping the dark/light visibility classes, and makes small formatting tweaks (e.g., code fence language and keyword formatting). custom-domain.mdx also adds a new Card block at the top.

Renames the authentication setup page title to Security across English, Spanish, French, and Chinese (deploy/authentication-setup.mdx and locale variants), which may affect navigation/search labeling.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Placeholder card with nonsense title accidentally committed

High Severity

A <Card title="wefwe" icon="sparkles"> with a gibberish title was added to the top of the custom domain page. This appears to be test/debug content that was not meant to be committed. It renders a visible, empty card with the nonsensical title "wefwe" at the top of a production documentation page.