Introducing `vercel dev`: Serverless, on localhost

What this post added

Introduced `vercel dev` command for local development. This command unifies the development workflow by automatically handling cloning, dependency fetching, port synchronization, and runtime downloads. It supports hot-reloading for both frontend and backend (serverless functions), and emulates production environments for technologies like Gatsby, Go functions, and Node.js with Headless Chrome. It also functions as a static site server.