Github: write blog by github

Reference:

1. 利用GitHub写博客的几种方式: https://github.com/rainzhaojy/blogs/issues/1

2. https://yq.aliyun.com/roundtable/493552

3. https://linuxtechlab.com/how-to-install-github-on-ubuntu-step-by-step/

4. github pages: https://pages.github.com/