Revert "add(plugin-json): zoom-plugin external source (anthropics#175)" (anthropics#176)

This reverts commit 3f12086.

Author: tobinsouth

.claude-plugin/marketplace.json

@@ -333,16 +333,6 @@
       },
       "homepage": "https://github.com/figma/mcp-server-guide"
     },
-    {
-      "name": "zoom-plugin",
-      "description": "Claude plugin for planning, building, and debugging Zoom integrations across REST APIs, SDKs, webhooks, bots, and MCP workflows.",
-      "category": "productivity",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/zoom/zoom-plugin.git"
-      },
-      "homepage": "https://developers.zoom.us/"
-    },
     {
       "name": "pdf-viewer",
       "source": "./pdf-viewer",