Development Guide: Reorganize navigation and section indexes

docs/en/development/intro/index.md

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+# Development Basics
+
+## Compilation Documentation
+
+Xray supports a wide range of platforms, allowing you to perform cross-compilation on various systems yourself.
+
+Please click [Compilation Documentation](./compile.md) to view specific compilation-related content.
+
+## Design Philosophy
+
+The Xray kernel provides a platform upon which secondary development can be conducted.
+
+This chapter expounds on Xray's design goals and architecture.
+
+Please click [Design Philosophy](./design.md) to understand Xray's design goals and architecture.
+
+## Development Guidelines
+
+This chapter explains the guidelines to follow during the process of obtaining code, conducting development, and submitting PRs, as well as relevant coding conventions.
+
+Please click [Development Guidelines](./guide.md) to view the criteria to be followed in Xray development.