Add Rustyll Static Site Generator to Jamstack Generators

[matbrgz]

This PR adds documentation for Rustyll, a high-performance, Jekyll-compatible static site generator written in Rust.

📌 Overview

Rustyll was created to address performance bottlenecks in extremely large Jekyll projects (tens of thousands of pages, heavy collections, deep include trees).
It maintains the familiar Jekyll structure while leveraging Rust’s speed, safety, and parallel execution.

This addition includes:

• Front-matter metadata (title, repo, homepage, license, language, templates)
• A detailed description of Rustyll’s goals, philosophy, and compatibility
• Placement under src/site/generators/ following Jamstack’s conventions

🧩 Why Rustyll?

• Jekyll compatibility (Liquid templates, front matter, collections)
• High performance for very large sites
• Zero runtime dependencies
• Portable single binary
• Open-source and actively developed

📄 License Note

Rustyll is currently licensed under AGPL, which is correctly reflected in the metadata.

🙌 Invitation

I’m actively working on Rustyll’s first stable release.
Feedback, testing, and contributions from the Jamstack community are very welcome!

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