add repo links and star counts to distributions

[thesuperzapper]

Currently, the list of kubeflow distributions is overwhelming for new users.

This PR adds a small "GitHub Star Count" below each distribution's website link, which should help users make informed decisions about which distributions to test.

The star count is generated automatically by the widely used https://shields.io/ site, which is already used all over the Kubeflow org README's.

Screenshot

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: thesuperzapper
Once this PR has been reviewed and has the lgtm label, please assign chensun for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[thesuperzapper]

@jbottum @james-jwu @zijianjoy I am interested in your feedback about this PR, it adds the "GitHub Star Count" of each distribution to our "Installing Kubeflow" page.

This change is small, but will massively improve the new-user experience when searching for a distribution.

[Arhell]

/lgtm

[varodrig]

Please provide any comments on this PR. Thanks,
 @kubeflow/kubeflow-steering-committee @kubeflow/wg-training-leads @kubeflow/wg-pipeline-leads @kubeflow/wg-notebooks-leads @kubeflow/wg-manifests-leads @kubeflow/release-team @kubeflow/wg-data-leads @kubeflow/wg-deployment-leads

[varodrig]

Please provide any comments on this PR. Thanks,
@kubeflow/kubeflow-steering-committee @kubeflow/wg-training-leads @kubeflow/wg-pipeline-leads @kubeflow/wg-notebooks-leads @kubeflow/wg-manifests-leads @kubeflow/release-team @kubeflow/wg-data-leads @kubeflow/wg-deployment-leads

[varodrig]

/hold

has merged conflicts. waiting for approval.