Add secret for notion

Author: slimslenderslacks

prompts/catalog.yaml

@@ -2216,3 +2216,5 @@ registry:
       MCP Server for the Notion API, enabling Claude to interact with Notion workspaces.
     ref: github:docker/labs-ai-tools-for-devs?path=prompts/mcp/mcp-notion-server.md
     icon: https://avatars.githubusercontent.com/u/182288589?s=200&v=4
+    secrets:
+      - name: notion.api_token