clientumlatam/clientum ? reverse-engineered prompt

I want to turn this repo into a simple JavaScript app starter with a clean, modern homepage and a basic project structure that is easy to extend.

Please set up something that runs out of the box, looks decent on desktop and mobile, and includes a few useful starter sections like a welcome message, a short description area, and a simple call to action. Keep the code easy to read, add a sensible folder structure, and make sure the app starts without extra setup. If you need to check current docs online for anything, go ahead and do that.