chore(readme): update chart install instructions

[TPXP]

The chart registry moved to github package registry according to the chart readme, this PR updates setup instructions on this repository as well to use oci://ghcr.io/deliveryhero/helm-charts/node-problem-detector

Ref: https://github.com/deliveryhero/helm-charts/tree/master/stable/node-problem-detector

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[hakman]

Thanks @TPXP, this will help many users. 🚀

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman, TPXP

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[hakman]

/ok-to-test