add to the summary file

Author: Phil Whittaker

16/umbraco-cms/SUMMARY.md

@@ -358,6 +358,11 @@
   * [Additional preview environments support](reference/content-delivery-api/additional-preview-environments-support.md)
 * [Webhooks](reference/webhooks/README.md)
   * [Expanding Webhook Events](reference/webhooks/expanding-webhook-events.md)
+* [Developer MCP](reference/developer-mcp/README.md)
+  * [Key Concepts](reference/developer-mcp//concepts.md)
+  * [Configuration](reference/developer-mcp//configuration.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)
   * [Examine](reference/searching/examine/README.md)