update one-click deploy link

Author: commit111

samples/mcp/README.md

@@ -1,6 +1,6 @@
 # MCP
 
-[![1-click-deploy](https://defang.io/deploy-with-defang.png)](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-<YOUR_SAMPLE_DIR#REMOVE_ME_AFTER_EDITING>-template%26template_owner%3DDefangSamples)
+[![1-click-deploy](https://defang.io/deploy-with-defang.png)](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-mcp-template%26template_owner%3DDefangSamples)
 
 This is a sample of an MCP (Model Context Protocol) chatbot application built with Next.js, Python, and Claude, deployed using Defang.