clientIO/joint-demos ? reverse-engineered prompt

Build me a clean demo site for a diagramming library, with a homepage that shows a big catalog of interactive examples and lets me open each one. I want it to feel like a showcase for things like flowcharts, org charts, BPMN, timelines, kanban boards, mind maps, trees, and network diagrams, with each demo living in its own page and having a simple README or short note on how to run it.

Make it easy to add more demos later, and include a way to build the whole site, run a local dev server, and compare screenshots so I can catch visual changes. If there are any setup details for private packages or tokens, handle that clearly in the instructions. Use current docs online if you need to.

The main goal is a polished gallery of reusable diagram examples that people can browse, copy, and adapt for their own projects.