“Car instances” example should be in the “Objects” category

[outofambit]

The “Car instances” example should be in the “Objects” category rather than the “Instance Mode” category on the examples page.

Reported to me by Professor WM Harris, who originally authored this example.

Implementation

Making this change requires:

• moving the example itself (english version: https://github.com/processing/p5.js-website/blob/main/src/data/examples/en/15_Instance_Mode/03_Car_Instances.js) from src/data/examples/en/15_Instance_Mode to src/data/examples/en/11_Objects
• making the same move for the Spanish, Korean, and Chinese versions within their respective folders