It's in the first section when you click the one colored button ("Getting Started") on the front page:

Vite (French word for "quick", pronounced /vit/, like "veet") is a build tool that aims to provide a faster and leaner development experience for modern web projects. It consists of two major parts:

* A dev server that provides rich feature enhancements over native ES modules, for example extremely fast Hot Module Replacement (HMR).

* A build command that bundles your code with Rollup, pre-configured to output highly optimized static assets for production.