Is your feature request related to a problem? Please describe.
Cheat only searches the current directory for a .cheat directory.

Describe the solution you'd like
cheat should search the directory hierarchy for .cheat directories. This scope could be limited to say, search the directory hierarchy until $HOME and no further.

Describe alternatives you've considered
I've found cheat useful in project directories, but documentation of this sort works only if I am in the root of my project. I would like this to work even if I am in a sub directory without having to cd to my project root.