CORS-2167: Remove UPI Metal TF references

[barbacbd]

** Removed the Example and terraform data in upi/metal
** Updated the docs in docs/user/metal to reflect the changes above. Pointing the user towards the official docs.

[sadasu]

/approve

[openshift-ci]

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[openshift-ci]

@barbacbd: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/okd-e2e-aws	a0e75fe	link	false	/test okd-e2e-aws

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[r4f4]

Is there a reason to keep the empty metal directory around?

[barbacbd]

There is not. I dont know why it remained I deleted it.

[barbacbd]

Git does not track directories that are empty. I think this is just a local copy from your system. I cannot delete something from git that git does not think exists at this point.

[r4f4]

/lgtm