docs: add usage section for MinerU and update output file link in index.md

docs/en/quick_start/index.md

@@ -90,3 +90,7 @@ MinerU provides a convenient Docker deployment method, which helps quickly set u
 You can get the [Docker Deployment Instructions](./docker_deployment.md) in the documentation.
 
 ---
+
+### Using MinerU
+
+You can use MinerU for PDF parsing through various methods such as command line, API, and WebUI. For detailed instructions, please refer to the [Usage Guide](../usage/index.md).

docs/en/usage/index.md

@@ -19,7 +19,7 @@ mineru -p <input_path> -o <output_path>
 >- `<input_path>`: Local PDF/image file or directory
 >- `<output_path>`: Output directory
 >
-> For more information about output files, please refer to [Output File Documentation](./output_file.md).
+> For more information about output files, please refer to [Output File Documentation](../output_files.md).
 
 > [!NOTE]
 > The command line tool will automatically attempt cuda/mps acceleration on Linux and macOS systems. 

docs/zh/quick_start/index.md

@@ -89,4 +89,8 @@ uv pip install -e .[core] -i https://mirrors.aliyun.com/pypi/simple
 MinerU提供了便捷的docker部署方式，这有助于快速搭建环境并解决一些棘手的环境兼容问题。
 您可以在文档中获取[Docker部署说明](./docker_deployment.md)。
 
----
+---
+
+### 使用 MinerU
+
+您可以通过命令行、API、WebUI等多种方式使用MinerU进行PDF解析，具体使用方法请参考[使用指南](../usage/index.md)。

docs/zh/usage/index.md

@@ -19,7 +19,7 @@ mineru -p <input_path> -o <output_path>
 > - `<input_path>`：本地 PDF/图片 文件或目录
 > - `<output_path>`：输出目录
 > 
-> 更多关于输出文件的信息，请参考[输出文件说明](./output_file.md)。
+> 更多关于输出文件的信息，请参考[输出文件说明](../output_files.md)。
 
 > [!NOTE]
 > 命令行工具会在Linux和macOS系统自动尝试cuda/mps加速。Windows用户如需使用cuda加速，