Remove usage of deprecated "flow" in Kamelet CRD in the documentation examples

[apupier]

For the Kamelet CRD, the flow element is deprecated based on the description

camel-k/helm/camel-k/crds/crd-kamelet.yaml

Line 217 in 48422c0

description: 'Deprecated: use template'

        "flow": {
          "description": "Deprecated: use template",
          "type": "object",
          "x-kubernetes-preserve-unknown-fields": true
        },

But the documentation is using it at least here https://camel.apache.org/camel-k/1.7.x/kamelets/kamelets-dev.html#_creating_a_simple_kamelet

[squakez]

It's one of the task of #2751. We will have to update the documentation accordingly.

[github-actions]

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[squakez]

Fixed in c637a04