Fix the links in the book

docs/src/README.md

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+# The Asterinas Book
+
+<p align="center">
+    <img src="images/logo_en.svg" alt="asterinas-logo" width="620"><br>
+</p>
+
+Welcome to the documentation for Asterinas,
+an open-source project and community
+focused on developing cutting-edge Rust OS kernels.
+
+## Book Structure
+
+This book is divided into five distinct parts:
+
+#### [Part 1: Asterinas Kernel](kernel/)
+
+Explore the modern OS kernel at the heart of Asterinas.
+Designed to realize the full potential of Rust,
+Asterinas Kernel implements Linux ABI in a safe and efficient way.
+This means it can seamlessly replace Linux,
+offering enhanced safety and security.
+
+#### [Part 2: Asterinas Framework](framework/)
+
+The Framework lays down a minimalistic, powerful, and solid foundation
+for OS development.
+It's akin to Rust's `std` crate
+but crafted for the demands of _safe_ Rust OS development.
+Asterinas Kernel is built on this very Framework.
+
+#### [Part 3: Asterinas OSDK](osdk/guide/)
+
+The OSDK is a command-line tool
+that streamlines the workflow to 
+create, build, test, and run Rust OS projects
+that are built upon Asterinas Framework.
+Developed specifically for OS developers,
+it extends Rust's Cargo tool to better suite their specific needs.
+OSDK is instrumental in the development of Asterinas Kernel.
+
+#### [Part 4: Contributing to Asterinas](to-contribute/)
+
+Asterinas is in its early stage
+and welcomes your contributions!
+This part provides guidance
+on how you can become an integral part of the Asterinas project.
+
+#### [Part 5: Requests for Comments (RFCs)](rfcs/)
+
+Significant decisions in Asterinas are made through a transparent RFC process.
+This part describes the RFC process
+and archives all approvaed RFCs.
+
+## Licensing
+
+Asterinas's source code and documentation primarily use the 
+[Mozilla Public License (MPL), Version 2.0](https://github.com/asterinas/asterinas/blob/main/LICENSE-MPL).
+Select components are under more permissive licenses,
+detailed [here](https://github.com/asterinas/asterinas/blob/main/.licenserc.yaml).
+
+Our choice of the [weak-copyleft](https://www.tldrlegal.com/license/mozilla-public-license-2-0-mpl-2) MPL license reflects a strategic balance:
+
+1. **Commitment to open-source freedom**:
+We believe that OS kernels are a communal asset that should benefit humanity.
+The MPL ensures that any alterations to MPL-covered files remain open source,
+aligning with our vision.
+Additionally, we do not require contributors
+to sign a Contributor License Agreement (CLA),
+[preserving their rights and preventing the possibility of their contributions being made closed source](https://drewdevault.com/2018/10/05/Dont-sign-a-CLA.html).
+
+2. **Accommodating proprietary modules**:
+Recognizing the evolving landscape
+where large corporations also contribute significantly to open-source,
+we accommodate the business need for proprietary kernel modules.
+Unlike GPL,
+the MPL permits the linking of MPL-covered files with proprietary code.
+
+In conclusion, we believe that
+MPL is the best choice
+to foster a vibrant, robust, and inclusive open-source community around Asterinas.