Fork of Let's Make a Face Part I
A stylized smiley face rendered with React and D3 v6, built from basic SVG shapes. The face features a yellow circle, two black eyes, and a mouth drawn using D3's `arc()` generator. A React component computes layout constants for the center, eye offsets, and dimensions, then transforms an SVG group to position the elements. The mouth arc uses inner and outer radii with a half-rotation, while the face circle is sized relative to the viewport height and stroke width.