feat: Initial website

[ehsavoie]

Creating our own website

[gemini-code-assist]

Code Review

This pull request adds a static documentation site for the A2A Java SDK built with Roq. The review feedback identifies several critical issues across the configuration, scripts, and documentation examples. Specifically, the Maven configuration in docs/pom.xml uses a non-existent plugin version and an unsupported Java compiler release. The JavaScript in head-scripts.html references a mutable CDN branch and lacks a null check on a DOM query. Additionally, the code examples in server.md contain potential null pointer dereferences and compilation errors, while the Qute template in about.md has a syntax error due to an incomplete Elvis operator.

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