fix: remove dead navigation tab entries for tutorials/comparisons/use-cases/blog

The previous PR (#34) removed the content files but the tab entries in
docs.json navigation remained, causing 404 errors for all 15 languages.

Removes 60 dead tab entries (4 per language × 15 languages) referencing
non-existent tutorials/, comparisons/, use-cases/, and blog/ pages.

All languages now correctly show only: Guides, API Reference, MCP Servers, Resources.

Author: acedatacloud-dev