a2aproject/A2A ? reverse-engineered prompt

Build me a clean documentation site for the Agent2Agent protocol.

I want it to explain what A2A is, why it matters, and how agents can discover each other, exchange messages, and work together without exposing their internal details. Include a clear home page, a full protocol specification section, getting started guides, examples, and a contributor section. It should feel like an open source project docs site, polished and easy to navigate.

Please make the content easy to read for people who are new to the idea of agents talking to other agents, but still detailed enough for engineers who want to implement it. Add good navigation, search friendly structure, and a simple way to keep the spec and docs organized.

If you need to check current docs or best practices online, go ahead and look them up. Make sure the site is ready to publish and looks professional on desktop and mobile.