Remove duplicate mcp-toolkit.md reference from SUMMARY.md

Removed the obsolete MCP as a Toolkit entry that was referencing the deleted mcp-toolkit.md file.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Phil Whittaker

16/umbraco-cms/SUMMARY.md

@@ -370,7 +370,6 @@
   * [Configuration](reference/developer-mcp/configuration.md)
   * [Available Tools](reference/developer-mcp/available-tools.md)
   * [Excluded Tools](reference/developer-mcp/excluded-tools.md)
-  * [MCP as a Toolkit](reference/developer-mcp//mcp-toolkit.md)
   * [Making the most of the developer MCP](reference/developer-mcp/how-best-to-use.md)
 * [API versioning and OpenAPI](reference/api-versioning-and-openapi.md)
 * [Searching](reference/searching/README.md)