docs: add links to detailed documentation in READMEs

Author: byteland-app

README.md

@@ -90,6 +90,15 @@ console.log(
 );
 ```
 
+## 📚 Documentation
+
+- [Introduction](docs/intro.md)
+- [Getting Started](docs/getting-started/installation.md)
+- [Core Concepts](docs/core-concepts/overview.md)
+- [Styling Guide](docs/styling/index.md)
+- [Advanced Usage](docs/advanced/index.md)
+- [Cookbook](docs/cookbook/index.md)
+
 ## 📖 API Reference
 
 ### TaffyTree

docs/i18n/ja-JP/README.md

@@ -90,6 +90,15 @@ console.log(
 );
 ```
 
+## 📚 ドキュメント
+
+- [はじめに](../../intro.md)
+- [クイックスタート](../../getting-started/installation.md)
+- [コアコンセプト](../../core-concepts/overview.md)
+- [スタイリングガイド](../../styling/index.md)
+- [高度な使い方](../../advanced/index.md)
+- [クックブック](../../cookbook/index.md)
+
 ## 📖 API リファレンス
 
 ### TaffyTree

docs/i18n/zh-CN/README.md

@@ -90,6 +90,15 @@ console.log(
 );
 ```
 
+## 📚 详细文档
+
+- [简介](../../intro.md)
+- [快速上手](../../getting-started/installation.md)
+- [核心概念](../../core-concepts/overview.md)
+- [样式指南](../../styling/index.md)
+- [高级用法](../../advanced/index.md)
+- [Cookbook](../../cookbook/index.md)
+
 ## 📖 API 参考
 
 ### TaffyTree