.. toctree::
   :maxdepth: 3
   :caption: KE3015 KE3016 keyes入门学习套件进阶版 基于Arduino

   README.md
   docs/1. 产品介绍/产品介绍.md
   docs/2. Arduino 课程/2. Arduino课前准备.md
   docs/3. Mixly 课程/3. Mixly 课程.md
   docs/4. Scratch 课程/4. Scratch 课程.md