add redirect for /ai/mcp-gateway/ (#23495)

- relates to #23449
- fixes #23494


This page was moved in a790ef7, but
didn't add a redirect.

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## Description

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## Related issues or tickets

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## Reviews

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- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

content/manuals/ai/mcp-catalog-and-toolkit/mcp-gateway.md

@@ -3,6 +3,8 @@ title: MCP Gateway
 description: "Docker's MCP Gateway provides secure, centralized, and scalable orchestration of AI tools through containerized MCP servers—empowering developers, operators, and security teams."
 keywords: MCP Gateway
 weight: 40
+aliases:
+  - /ai/mcp-gateway/
 ---
 
 The MCP Gateway is Docker's open-source enterprise-ready solution for