Revert #3782 "Added Pipelines v2 installation pages"

[thesuperzapper]

Reverts #3782

Please see #3782 (comment).

[thesuperzapper]

@hbelmiro as I was saying in #3782 (comment), the PR #3782 was unacceptable for a few reasons and needs to be reverted ASAP:

1. It made no actual content changes while moving pages from the V1 to the V2 section
2. It added pages to the V2 section which have no relationship to the Kubeflow Pipelines V2 (like "Choose an executor").
3. It removed the docs for installing KFP v1.
4. It did not add any redirects making all old links into 404s.

[thesuperzapper]

@andreyvelich @rimolive either of you could also approve this PR, because it's very important that we revert soon.

[thesuperzapper]

Also @kubeflow/pipelines might be interested to see that we are reverting a strange PR in the KFP docs.

[rimolive]

@thesuperzapper Why reverting the change instead of fixing the missing links? I just checked the docs and I could not find any missing/broken link so please point me to these ones so we can fix asap.

[thesuperzapper]

You are not reading my comment #3791 (comment), the primary issue is that it's not acceptable to move V1 docs into the V2 section without regard for the content.

Also, here is a list of links that are now 404:

• https://www.kubeflow.org/docs/components/pipelines/legacy-v1/installation/choose-executor/
• https://www.kubeflow.org/docs/components/pipelines/legacy-v1/installation/compatibility-matrix/
• https://www.kubeflow.org/docs/components/pipelines/legacy-v1/installation/localcluster-deployment/
• https://www.kubeflow.org/docs/components/pipelines/legacy-v1/installation/overview/
• https://www.kubeflow.org/docs/components/pipelines/legacy-v1/installation/standalone-deployment/
• https://www.kubeflow.org/docs/components/pipelines/legacy-v1/installation/upgrade/

But even if you had created the appropriate redirects, I would still be suggesting a revert, because it's just not helpful to move docs so that they become incorrect (in the wrong section).

[rimolive]

KFP docs are still WIP and there's a lot of work tracked in this issue. #3712

Reverting this change will block us on #3729 and this is critical as this is part of the Kubeflow 1.9 change.

[thesuperzapper]

@rimolive please don't try and defend the PR, just accept the reverse and make a new one, everyone makes mistakes.

It was never acceptable to randomly move V1 docs into the V2 section.

[hbelmiro]

@rimolive @thesuperzapper I'm approving this revert and will create a new installation page for v2 with minimal information to install v2. We can iterate later.

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[hbelmiro]

@thesuperzapper can you please rebase?

[thesuperzapper]

@hbelmiro I have rebased the PR.

[hbelmiro]

/lgtm