git submodule init
git submodule update
// 也有可能 sumbodule 可能会包含其他的 git repo, 所以可以使用一下的命令
git submodule update --init --recursive
otherwise you can meet following error:
found no layout file for "HTML" for kind "home"
1. hugo new content posts/xxx.md
2. edit the md
3. After done change the draft status to False
3. run hugo
4. commit the submodule docs