Fork of Smiley Face Part II
This example shows a smiley face rendered as a responsive SVG, with the entire graphic scaling to fit the browser window and centered dynamically. It uses React components to structure the drawing, computing coordinates from `window.innerWidth` and `window.innerHeight`. The face is built with basic SVG shapes, including a yellow circle with a thick black stroke for the head and simple black circles for the eyes. A mouth is drawn using the D3 `arc` function with inner and outer radii and specific start and end angles, while a second path is generated from D3’s `line`, demonstrating how D3 geometry can create the facial features within a React-based SVG.