Pipelines: Need separate API reference for Pipelines standalone

[sarahmaddox]

We currently have one API reference for Pipelines:
https://www.kubeflow.org/docs/pipelines/reference/
It reflects the Pipelines API that is integrated in the current version of Kubeflow.

However, the Pipelines Standalone deployment may offer a different (later) version of Pipelines.

We should have two references, one for the Pipelines version included with Kubeflow and another for the Pipelines Standalone deployment.

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[sarahmaddox]

/assign @jingzhang36

@jingzhang36 Assigning this to you with thanks.

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