Update README.md

[AnalogJ]

remove additional leftover chefdk folders.

[chef-supermarket]

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[chef-supermarket]

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[sersut]

Thanks for the quick update @AnalogJ. I think since this change applies to all operating systems, maybe we should have a new section in ## Uninstallation Instructions that says to delete /opt/chefdk or c:\opscode\chefdk for windows and the gems directory under home.

Would be great if you can make a quick update. Otherwise we'll get to this when we have some cycles.

Thanks again for spending time to make Chef DK better @AnalogJ.

[sersut]

Also since this is a documentation update we can cover this under the obvious fix policy.

[sersut]

Merging this in under the obvious fix policy. Thanks @AnalogJ