Temporarily removing the agents doc while we refactor it (#44993)

Author: jmatthiesen

docs/ai/toc.yml

@@ -31,8 +31,6 @@ items:
   items:
   - name: How generative AI and LLMs work
     href: conceptual/how-genai-and-llms-work.md
-  - name: How agents and copilots work with LLMs
-    href: conceptual/agents.md
   - name: Tokens
     href: conceptual/understanding-tokens.md
   - name: Embeddings