[Writer] Remove Tron docs and add deprecation notice

[JackReacher0807]

Summary

• Removed all Tron chain documentation (API quickstart, FAQ, overview pages)
• Removed Tron OpenAPI specs (tron-http, tron-solidity-http) and OpenRPC spec
• Removed Tron API generator configs
• Removed Tron from supported chains list and compute unit costs
• Created Tron deprecation notice page (matching Lumia deprecation format)
• Updated docs.yml sidebar to show only deprecation notice under Tron section
• Added redirects from all old Tron pages to the deprecation notice
• Preserved historical changelog entry

[github-actions]

🌿 Documentation Preview

Name	Status	Preview	Updated (UTC)
Alchemy Docs	✅ Ready	🔗 Visit Preview	Feb 12, 2026, 3:39 AM

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Mark Tron redirect entries as permanent

The newly added Tron deprecation redirects omit permanent: true, unlike the existing deprecation redirect blocks (for example Lumia), so requests to old Tron URLs can be served as non-permanent redirects instead of canonical moves. This weakens migration behavior for users and crawlers hitting /reference/tron-api-endpoints and the old Tron reference pages, and it is likely unintentional because every neighboring redirect entry explicitly sets permanence.

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