Moving central dashboard links to configmap

[SachinVarghese]

Description of your changes:
Related to kubeflow/kubeflow#5147 (To be merged after central dashboard PR merges)

Checklist:

• Unit tests have been rebuilt:
  1. cd manifests/tests
  2. make generate-changed-only
  3. make test

[kubeflow-bot]

This change is 

[k8s-ci-robot]

Hi @SachinVarghese. Thanks for your PR.

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[swiftdiaries]

/ok-to-test

[krishnadurai]

/lgtm

[swiftdiaries]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[HassanOuda]

@swiftdiaries @SachinVarghese Can we have this cherrypicked into v1.1 branch?