tandpfun/skill-icons ? reverse-engineered prompt

Build me a simple web service that lets people show off their skills on a GitHub README or résumé with neat little SVG icons.

I want it to work like the skill icons site in the README, where someone can paste a link like https://skillicons.dev/icons?i=js,html,css and get a single image back with the matching icons. Please make it support choosing multiple icons, changing the theme between dark and light, and setting how many icons appear per line. The icons should resize cleanly and look good in README markdown.

Keep it fast and easy to use, and make sure it works as an image people can embed anywhere. If anything is unclear, look up the current docs online and follow the existing style of the project.