Remove headers section from context7 MCP config

Co-authored-by: Vova Ignatov <ignatovv@users.noreply.github.com>

Author: github-actions[bot]

.mcp.json

@@ -14,10 +14,7 @@
     },
     "context7": {
       "type": "http",
-      "url": "https://mcp.context7.com/mcp",
-      "headers": {
-        "CONTEXT7_API_KEY": "YOUR_API_KEY"
-      }
+      "url": "https://mcp.context7.com/mcp"
     }
   }
 }