Point supabase plugin to supabase-community/supabase-plugin (#1442)

Remove the in-repo supabase stub; source from the external repo.

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

.claude-plugin/marketplace.json

@@ -1469,8 +1469,11 @@
       "name": "supabase",
       "description": "Supabase MCP integration for database operations, authentication, storage, and real-time subscriptions. Manage your Supabase projects, run SQL queries, and interact with your backend directly.",
       "category": "database",
-      "source": "./external_plugins/supabase",
-      "homepage": "https://github.com/anthropics/claude-plugins-public/tree/main/external_plugins/supabase"
+      "source": {
+        "source": "url",
+        "url": "https://github.com/supabase-community/supabase-plugin.git"
+      },
+      "homepage": "https://github.com/supabase-community/supabase-plugin"
     },
     {
       "name": "superpowers",

external_plugins/supabase/.claude-plugin/plugin.json

@@ -1,7 +0,0 @@
-{
-  "name": "supabase",
-  "description": "Supabase MCP integration for database operations, authentication, storage, and real-time subscriptions. Manage your Supabase projects, run SQL queries, and interact with your backend directly.",
-  "author": {
-    "name": "Supabase"
-  }
-}

external_plugins/supabase/.mcp.json

@@ -1,6 +0,0 @@
-{
-  "supabase": {
-    "type": "http",
-    "url": "https://mcp.supabase.com/mcp"
-  }
-}