Summary

Implements Phase 1 of the docs IA proposal: reorganize the Documentation and API Reference tabs around product lines.

This is a nav-only change — no files are moved, no content is rewritten. All pages stay at their current URLs. Only docs.json navigation structure changes, plus 3 title renames.

Documentation tab

Dissolved: Essentials, Learning & How-Tos, Best Practices, XML and HTML Handling, Resources

New structure: Getting Started, Languages, Translate (with Text Translation and XML & HTML groups), Customizations, Admin, Going to Production, Cookbooks, Developer Tools, API Updates

API Reference tab

Dissolved: single flat "API Reference" group

New structure: 6 product-line groups — Translate API, Voice API, Write API, Customizations API, Admin API, Languages

Other changes

• Navbar: replaced "DeepL Web Translator" with "API Pricing" and "Manage Keys" links
• Title renames: "Client libraries" → "SDKs", "Test your API requests with Postman" → "Postman", "Roadmap and release notes" → "Changelog"
• Pages hidden from nav (files still exist for Phase 2 merges): About, DeepL 101, Authentication, Client libraries reference, Cookbook overview

What this does NOT change

• No files moved (URLs unchanged, no redirects needed)
• No content rewrites (Phase 2)
• No new pages created (Phase 3)
• Voice and Write sections in Documentation tab deferred until overview pages exist

Test plan

• Verify Mintlify preview deploys successfully
• Spot-check Documentation tab nav matches target IA
• Spot-check API Reference tab has 6 product-line groups
• Verify navbar shows API Pricing and Manage Keys links
• Verify SDKs, Postman, and Changelog titles render correctly
• Check DEPRECATED tag on Glossaries v2 group
• Check BETA tag on Detect Language and v3 Languages groups
• Confirm hidden pages (About, Auth, DeepL 101) don't appear in sidebar

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