chore(mcp): remove supervisor entry from .mcp.json

.mcp.json

@@ -1,12 +1,5 @@
 {
   "mcpServers": {
-    "supervisor": {
-      "type": "http",
-      "url": "https://supervisor-mcp.d-ma.be/mcp",
-      "headers": {
-        "Authorization": "Bearer ${SUPERVISOR_MCP_TOKEN}"
-      }
-    },
     "brain": {
       "type": "http",
       "url": "https://brain-mcp.d-ma.be/mcp",