Add migration-to-aws to marketplace

Replace the Google Forms link with the new plugin directory
submission link (https://clau.de/plugin-directory-submission).

https://claude.ai/code/session_01NxRDJKDvFR2d4wC4ppDEDT

Co-authored-by: Claude <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -684,6 +684,18 @@
         "url": "https://github.com/semgrep/mcp-marketplace.git"
       },
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
+    },
+    {
+      "name": "migration-to-aws",
+      "description": "Assess current cloud provider usage and billing to estimate and compare AWS services and pricing, with recommendations for migration or continued use of current provider.",
+      "category": "migration",
+      "source": {
+        "source": "git-subdir",
+        "url": "https://github.com/awslabs/agent-plugins.git",
+        "path": "plugins/migration-to-aws",
+        "ref": "main"
+      },
+      "homepage": "https://github.com/awslabs/agent-plugins"
     }
   ]
 }