Ashutosh00710/github-readme-activity-graph ? reverse-engineered prompt

Build me a small web app that generates a GitHub activity graph for a user’s last 31 days of activity, something people can embed in their profile README as an image link.

It should let me pass a GitHub username in the URL, fetch the user’s recent activity, and render a clean graph with a few theme options and simple customization through query params like background color, line color, border, title, height, radius, and whether to show the area under the line. I’d like a default nice looking theme, plus a handful of alternate themes that feel like the ones in the README.

Please make it easy to deploy and use from a public URL, and make the graph itself update dynamically based on the requested username and settings. If anything needs current docs or API behavior, look it up online and keep it working with today’s GitHub setup.