I'd like to organize my GitHub wiki pages in subdirectories. How do we refer to the pages in subdirectories?
github wiki / gollum-wiki doesn't inherently provide anything explicit for organizing pages into sub-directories. Any page can be linked from any other page irrespective of where it logically belongs. This is a powerful feature that makes wikis very flexible.
One way to implement a sub-directories structure would be to follow a naming convention.
Example: Having all pages related to subject1 have names that start with subject1, and so on.
来源：https://stackoverflow.com/questions/14408376/how-can-you-use-subdirectories-in-a-github-wiki-checkout