github二级域名

文档, https://docs.github.com/en
指南, https://guides.github.com/
支持, https://support.github.com/
hub, https://hub.github.com/
教育, https://education.github.com/
帮助, https://docs.github.com/en
资源, https://resources.github.com/
github, https://github.github.com/
classroom, https://classroom.github.com/