挑战声明
这项挑战涉及使用Docker封装一个名为Mkdocs（ ）的工具来生产和服务网站，因为我们不想在本地安装Mkdocs。 这个想法是：
● Create a Git project that builds a Docker image.
● This Docker image, when run, should accept a directory from your local
filesystem as input and use Mkdocs to produce and serve a website.
● This local directory is the root of a valid Mkdocs project with which this tool
can create the site.
细节
生产网站从命令行执行此操作时：
$ docker run
