Running command in README errors, upstream folder does not exist

[aladesawe]

Pull Request Template for Kubeflow manifests Issues

✏️ A brief description of the changes

I changed the README file to update the Central Dashboard component installation dir

📦 List any dependencies that are required for this change

N/A

🐛 If this PR is related to an issue, please put the link to the issue here.

N/A

✅ Contributor checklist

• Make sure you have tested with kustomize. See Installation Prerequisites
• All the commits have been signed-off (To pass the DCO check)

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[juliusvonkohout]

/lgtm
/approve

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