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

@@ -684,17 +684,6 @@
         "url": "https://github.com/semgrep/mcp-marketplace.git"
       },
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
-    },
-    {
-      "name": "adspirer-ads-agent",
-      "description": "Cross-platform ad management for Google Ads, Meta Ads, TikTok Ads, and LinkedIn Ads. 91 tools for keyword research, campaign creation, performance analysis, and budget optimization.",
-      "category": "productivity",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/amekala/adspirer-mcp-plugin.git",
-        "sha": "aa70dbdbbbb843e94a794c10c2b13f5dd66b5e40"
-      },
-      "homepage": "https://www.adspirer.com"
     }
   ]
 }