Updated Helm Install command with create namespace flag

[ShubhamTatvamasi]

Updated Portainer chart docs to prefer Helm-native namespace creation (--create-namespace) and remove duplicate explicit kubectl create namespace command.

https://artifacthub.io/packages/helm/portainer/portainer

[Copilot]

Pull request overview

Updates the Portainer Helm chart README to streamline namespace setup by recommending Helm’s --create-namespace flag and reflecting it in install/upgrade examples.

Changes:

• Replaced the “pre-create namespace” instructions with guidance to use --create-namespace (or create via kubectl).
• Added --create-namespace to the testing and installation Helm commands.

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[Copilot]

The dry-run example includes --create-namespace, but Helm does not create the namespace when --dry-run is set (it exits before the create-namespace logic). This can mislead readers into thinking the namespace will be created during testing; consider removing --create-namespace from the dry-run command or adding a note that it only takes effect on a real install/upgrade.

Suggested change

	helm install --dry-run --debug --create-namespace -n portainer portainer deploy/helm/portainer
	helm install --dry-run --debug -n portainer portainer deploy/helm/portainer