gh-deploy assumes docs dir is located in repository root

[gitblit]

gh-deploy is assuming the docs directory is located in the root of the repository. In my case, I've located my project/site sources in a subdirectory (e.g. /site/docs) and the following check causes gh-deploy to immediately terminate:

https://github.com/mkdocs/mkdocs/blob/master/mkdocs/gh_deploy.py#L10

I'm not sure if there are other downstream failures from this initial termination, but it would be nice to be able to use gh-deploy in this scenario.

[waylan]

Is this the same as #543? If so, I suppose this could be better documented.

[d0ugal]

Somewhat related, but this is worse 😄 If I had the following layout

/project/
/project/.git <- this is the repo
/docs/
/docs/mkdocs.yml
/docs/source/ <- the markdown files

You would need to be in the directory above the mkdocs.yml for gh-deploy to be happy. So, we should use this:

git rev-parse --is-inside-work-tree

[gitblit]

👍 That would be super.