Update copilot extension - end of life GitHub Copilot Extension

Author: nade7o

ai-coding-assistant/copilot-extension.md

@@ -11,6 +11,10 @@ position: 1
 
 The Telerik WinForms [GitHub Copilot](https://github.com/features/copilot) extension is an AI-powered coding assistant that provides specialized knowledge about [Telerik UI for WinForms components](https://www.telerik.com/products/winforms.aspx). 
 
+>caution [Microsoft is sunsetting GitHub Copilot extensions](https://github.blog/changelog/2025-09-24-deprecate-github-copilot-extensions-github-apps/) on November 10th, 2025, in favor of the Model Context Protocol (MCP) standard. 
+> 
+> From that date, the Telerik and Kendo UI AI Coding Assistants will be available exclusively through our [MCP server]({%slug ai-mcp-server%}), ensuring you continue to enjoy the same powerful capabilities that are delivered by a modern, open, and officially recommended standard.
+
 This extension enhances GitHub Copilot with proprietary context about Telerik WinForms controls, helping you:
 
 * Generate code snippets using Telerik WinForms components.