Update from support feedback: document indexing toggle side effects

[mintlify]

Summary

Corrects the documented behavior of the Don't index project setting, which gates llms.txt but not llms-full.txt (verified in server code), and documents that hidden: true on a version or other top-level navigation element removes all descendant pages from the site search index. Adds two symptom-named help center articles so users hitting either issue can self-serve. Includes a maintenance pass: French, Spanish, and Chinese translations of all changed pages, mirrored navigation entries, an anchor fix, and an SEO-length description fix.

Changes

• optimize/seo.mdx: fixed the incorrect claim that the setting 404s llms-full.txt; noted that .md exports keep their /llms.txt pointer; corrected the #llms-fulltxt anchor.
• organize/hidden-pages.mdx: new "Hide a version or other top-level navigation element" section, new table row, and a warning that hiding your only version empties site search (versions don't support searchable: true).
• ai/llmstxt.mdx: note that the setting affects llms.txt but not llms-full.txt.
• New help center articles: llms-txt-returns-404-but-llms-full-txt-works and site-search-returns-no-results, added to the Help center group in docs.json; shortened the site-search article description to fit the 160-character limit.
• Mirrored all of the above into es/, fr/, and zh/, including the two new translated help center articles and matching entries in es.json, fr.json, and zh.json.

Support context

• No llms.txt
• Issue with search on our docs site

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Note

Low Risk
Documentation and navigation-only changes with no application code; risk is limited to doc accuracy and cross-locale consistency.

Overview
This PR updates Mintlify docs to match actual product behavior and add self-serve troubleshooting from support tickets.

Don't index project vs llms.txt / llms-full.txt: Docs previously said the setting 404s both files. They now state it only returns 404 for llms.txt (including /.well-known/llms.txt) while llms-full.txt stays available. Related notes were added on SEO, llms.txt, and a new help article Fix llms.txt returning 404 while llms-full.txt works (plus es/fr/zh).

Hidden top-level navigation: Hidden pages now documents hidden: true on versions, anchors, dropdowns, languages, and products—including a warning that hiding your only version can empty site search (no searchable: true on versions; use seo.indexing: "all" or remove hidden). A new help article Fix site search returning no results covers the same symptom.

Navigation in docs.json and locale JSON files registers both help center pages.

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