Get current profile if no arguments given

[MPLew-is]

As mentioned in #2371 there's currently no way to get the currently-active machine profile, which makes some automation I'm doing break when using different profiles. This fix just returns the current profile when no arguments are provided to the profile command, and updates the corresponding documentation.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: MPLew-is
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We suggest the following additional approver: luxas

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[MPLew-is]

CLA has been signed.

[tstromberg]

@minikube-bot OK to test

[tstromberg]

Thank you!