Add crossplatform home directory detection

[felixhudson]

I have noticed that the global config is not being used on windows. Here is my attempt to fix it.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity.

[tjex]

Makes sense, but you shouldn't need to create an err variable?
The method returns an error. https://pkg.go.dev/os#UserHomeDir

[felixhudson]

Yeah its odd having creating the error variable, but without it the compiler complains that err doesnt exist. Or with the := method it claims I can't override the home variable from the parent scope.

An alternative is to have home2, err := os.UserHomeDir() , then have an extra if statement to compare home with home2 and create a path with the correct one. But I thought that is just introducing an extra variable for no reason, and adds extra complexity.

I found this solution to be the most concise.