Add Swagger UI for Model Registry

[thesuperzapper]

This PR adds a Swagger UI Page page for the Kubeflow Model Registry REST API, similar to what we already have for Kubeflow Pipelines.

It is automatically generated from this swagger yaml file and will automatically point to the github tag that corresponds to the newly added model-registry/latest-version shortcode, which can be used to update the version.

It also updates the other pages to use the newly introduced model-registry/latest-version shortcode, which enables easier updating of the docs when new versions are released.

Screenshot

[google-oss-prow]

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[thesuperzapper]

@tarilabs @dhirajsb @ederign this is a cool addition to the model registry docs, and I think it should be easy to review.

We are adding a Swagger REST API doc based on your generated YAML, see the preview here:

• https://deploy-preview-3980--competent-brattain-de2d6d.netlify.app/docs/components/model-registry/reference/rest-api/