docs: llms.txt contains six links that return 404

Start with the root llms.txt and verify the six listed URLs with redirect-following HTTP GET requests. Compare them with the current CloudWeGo Eino documentation navigation, then update llms.txt so each entry resolves to a current page or obsolete entries are removed; repeat the URL checks to confirm none return 404.

Describe the bug

Six documentation URLs listed in the root llms.txt return HTTP 404 on the live CloudWeGo site:

1. https://www.cloudwego.io/docs/eino/core_modules/eino_adk/agent_implementation/supervisor/
2. https://www.cloudwego.io/docs/eino/core_modules/eino_adk/agent_implementation/workflow/
3. https://www.cloudwego.io/docs/eino/eino-cookbook/
4. https://www.cloudwego.io/docs/eino/quick_start/agent_llm_with_tools/
5. https://www.cloudwego.io/docs/eino/quick_start/simple_llm_application/
6. https://www.cloudwego.io/docs/eino/core_modules/flow_integration_components/checkpoint_interrupt/

This leaves LLM/documentation consumers with dead entries. The cookbook appears to have moved to https://www.cloudwego.io/docs/eino/cookbook/; the current navigation should be used to reconcile or remove the other stale entries.

To Reproduce

1. Check out main.
2. Extract the URLs from llms.txt.
3. Send GET requests while following redirects.
4. Observe HTTP 404 for all six URLs above.

Expected behavior

Every URL in llms.txt should resolve to the current documentation page, or obsolete entries should be removed.

Screenshots

Not applicable; each listed endpoint responds with HTTP 404.

Version:

main at ebd616c8291e957684ea6ca99dd54225d04e0438

Environment:

Live site checked on 2026-08-24 with redirect-following HTTP GET requests; English and Chinese documentation roots otherwise rendered successfully in a desktop and mobile browser.

Additional context

I checked open and closed issues, pull requests in every state, repository discussions, and the files changed by every currently open PR. I found no existing work covering these stale llms.txt entries.