Document FORCE_COLOR environment variable

[gberche-orange]

Closes partially carvel-dev/kapp#632

[vmwclabot]

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[cppforlife]

@gberche-orange thanks for adding this in. would you mind moving into kapp directory instead of kapp-controller.

[praveenrewar]

would you mind moving into kapp directory instead of kapp-controller.

I think having the kctrl example in kapp-controller directory makes sense. We could probably have a kapp example added as well (to the kapp directory) ?

[gberche-orange]

thanks @cppforlife and @praveenrewar

I've added two commits to also document FORCE_COLOR in the kapp documentation, and refined a bit the kctrl example command.

[praveenrewar]

LGTM!
@gberche-orange Can you please sign the cla (if not already done).

[vmwclabot]

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[vmwclabot]

@gberche-orange, VMware has approved your signed contributor license agreement.