Update webhook closed PR message link to clau.de

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

https://claude.ai/code/session_01NxRDJKDvFR2d4wC4ppDEDT

.claude-plugin/marketplace.json

@@ -684,19 +684,6 @@
         "url": "https://github.com/semgrep/mcp-marketplace.git"
       },
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
-    },
-    {
-      "name": "zapier",
-      "description": "Connect 8,000+ apps to your AI workflow. Discover, enable, and execute Zapier actions directly from your client.",
-      "category": "productivity",
-      "source": {
-        "source": "git-subdir",
-        "url": "zapier/zapier-mcp",
-        "path": "plugins/zapier",
-        "ref": "main",
-        "sha": "b93007e9a726c6ee93c57a949e732744ef5acbfd"
-      },
-      "homepage": "https://github.com/zapier/zapier-mcp/tree/main/plugins/zapier"
     }
   ]
 }