feat: add base directory config

[philstainer]

Add the ability to customize your base directory config

I wasn't able to get my local testing environment working so it doesn't have any tests atm :/

See the issue for more details.

Closes #96

[ThePrimeagen]

so we do have a failing test, could you take a look at it?

[TamaMcGlinn]

Can the help text also give us an example of how to use this, including the clone command to put the git info into .bare?