remove "Getting Started"/"Workstation Installation"

[thesuperzapper]

Closes #2565

As discussed in #2565, we are going to drop the "Workstation Installation" docs in favour of a refactored "Installing Kubeflow" page, see issue: #2590

[rui-vas]

Thank you for this PR @thesuperzapper !

/lgtm

Do you think we should wait for #2590? They are a bit orthogonal, given the well structured distributions list.

[thesuperzapper]

@RFMVasconcelos I agree that both this and #2590 should be merged at the same time, if only so that there aren't dangling links in the "Installing Kubeflow" page.

[rui-vas]

Sounds like a good plan :)

[thesuperzapper]

@RFMVasconcelos as we are about to merge #2611, I think we can go ahead an merge this.

[rui-vas]

@thesuperzapper as we now merged #2611, as agreed these workstation docs become redundant.

/lgtm
/approve

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