p5.js working-ish version

I've modified the p5.js version a bit, encapsulating the recursive calls, as well as the canvas drawing parts of the `render` function (so, all of it lol).

https://editor.p5js.org/solarliner@gmail.com/sketches/HyP9lOgdX

Open the linked p5.js sketch and compare it with the repository's QuickSort work, focusing on the render function, recursive calls, and canvas drawing. No file or test is named, so first locate the relevant entry point; done means the QuickSort visualization works with the proposed encapsulation.

索引モデルが issue の本文から書いたものです。