fix #2478

Changed the default mock delay from 1000 to false to disable delay by default.

Summary

Changed the default value of override.mock.delay from 1000 to false.
Default delay creates noise for initial users. Disabling it by default provides a better out-of-the-box experience.
The default mock delay is now false (disabled) instead of 1000ms. Users who want delay must explicitly set it.

// To maintain delay
export default {
  petstore: {
    output: {
+      mock: {
+        delay: 1000, // In milliseconds
+      },
    },
  },
};