Remove link in MCP Learning Path to Codex CLI until install guide is published.

Author: jasonrandrews

content/learning-paths/servers-and-cloud-computing/arm-mcp-server/1-overview.md

@@ -92,6 +92,6 @@ The required configuration steps vary by AI coding assistant. Refer to the insta
 - [GitHub Copilot](/install-guides/github-copilot/)
 - [Gemini CLI](/install-guides/gemini/)
 - [Kiro CLI](/install-guides/kiro-cli/)
-- [Codex CLI](/install-guides/codex-cli/)
+- Codex CLI
 
 In the next section, you'll use direct AI chat with the Arm MCP Server to check Docker base images for Arm compatibility.