Add blog post for installing grafana on openshift

[david-martin]

Uses latest v5 version of operator.
I based the post on https://cloud.redhat.com/experts/o11y/ocp-grafana/ (which uses v4),
but with a kuadrant spin on it as it's for the kuadrant blog.

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[eguzki]

LGTM

left minor comments

[eguzki]

pinning to a particular version? startingCSV is not really needed, unless you want a particular version, which may not exists now or in the future.

[david-martin]

I didn't realise it was optional
I'll remove it as installing the latest version sounds reasonable

[jsmolar]

• The token for Thanos DataSource is valid for a set amount of time. I wonder if you need to inform about this.
• User workload monitoring needs to be enabled as well: https://docs.openshift.com/container-platform/4.8/monitoring/enabling-monitoring-for-user-defined-projects.html
  you can verify this by: oc get cm/cluster-monitoring-config -n openshift-monitoring -ojsonpath='{.data.config\.yaml}'

[david-martin]

Thanks for reviewing @jsmolar
I've added a note about the token potentially expiring (with a link to openshift docs),
and a note about having user workload monitoring enabled (again, with a link to openshift docs).

[jasonmadigan]

looks good

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: david-martin, eguzki, jasonmadigan

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[jasonmadigan]

/lgtm