Update developer docs styles for World ID App

[igorosip0v]

Description

Updates developer documentation styling to reflect the World ID App design.

• Updates typography, navigation, cards, credential details, and copy controls across light and dark themes.
• Adds World UI Kit icons and replaces IDKit screenshots with SVG-based previews, including the partnership example.
• Preserves the existing page background and homepage layout; illustrative QR codes link to the documentation homepage.

Validation

Latest fixes reviewed in code. Tests and a final browser check were not run at the user's request.

[mintlify]

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Project	Status	Preview	Updated
world	🟢 Ready	View Preview	Oct 12, 2026, 4:23 PM

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-12T16:27:00.333527Z	67f0074	PR opened

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