docs: update installation instructions

[fmuyassarov]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Promote latest (and first) published Helm chart as the primary install method and move the raw manifest to a legacy fallback.

The chart is already in the production registry:

skopeo list-tags docker://registry.k8s.io/networking/dranet
[9:37 AM]skopeo list-tags docker://registry.k8s.io/networking/charts/dranet
{
    "Repository": "[registry.k8s.io/networking/charts/dranet](http://registry.k8s.io/networking/charts/dranet)",
    "Tags": [
        "v1.3.0"
    ]
}

and quick installation test passed to test artifact pulling worked fine

helm install dranet oci://registry.k8s.io/networking/charts/dranet --version v1.3.0
Pulled: [registry.k8s.io/networking/charts/dranet:v1.3.0](http://registry.k8s.io/networking/charts/dranet:v1.3.0)
Digest: sha256:762b9725c1dc45727741372b2c6188ef145f5809785500a1d575c6950891fec3
NAME: dranet
LAST DEPLOYED: Fri May 29 06:38:53 2026
NAMESPACE: default
STATUS: deployed
REVISION: 1
DESCRIPTION: Install complete
TEST SUITE: None

Which issue(s) this PR is related to:

"N/A".

Special notes for your reviewer:

Does this PR introduce a user-facing change?

"NONE"

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[fmuyassarov]

/cc @aojea @gauravkghildiyal

[aojea]

I'm a classic man, manifest is simpler and easier, helm adds a dependency that in this case is avoidable

[fmuyassarov]

I'm a classic man, manifest is simpler and easier, helm adds a dependency that in this case is avoidable

Fair enough. Would it makes sense at least to keep the oci based chart path here in the doc?

[aojea]

Fair enough. Would it makes sense at least to keep the oci based chart path here in the doc?

absolutely

[fmuyassarov]

Fair enough. Would it makes sense at least to keep the oci based chart path here in the doc?

absolutely

updated