BuilderIO/builder ? reverse-engineered prompt

Build me a polished website and demo app for a visual development platform like Builder.io.

I want a place where people can connect an existing app, edit pages visually with drag and drop, use their own components, and publish changes without coding everything by hand. The experience should make it feel easy to turn a design into working frontend content, with examples for common frameworks like React and Vue, and a simple way to try it out.

Please make it look modern and product focused, with clear messaging, a strong homepage, and a working demo flow that shows how the editor and content publishing works. If you need current implementation details or best practices, look them up online first, then build the cleanest version you can.