Installation docs: unresolved template params causing a dead link

[mflendrich]

The certmanager kubectl apply command under
https://operator.docs.scylladb.com/v1.15/installation/gitops.html#cert-manager

is broken because the handlebars templates {{repository}} and {{revision}} are not expanded:
kubectl apply --server-side -f=https://raw.githubusercontent.com/{{repository}}/{{revision}}/examples/third-party/cert-manager.yaml

[mflendrich]

Sounds similar to #2364

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