- Acquire source vector file.
- Simplify icon in vector editing tool (I use Affinity Designer).
- Constrain within a 16x16 viewbox.
- Ensure there are no strokes.
- Simplify and minimise paths.
- Make all paths white.
- Export SVG.
- Run SVGO on the SVG file.
- Add object to simple-icons.json.
- Run build.js in Node.