Update inference gateway public docs to use helm charts

[rahulgurnani]

This PR addresses issue #1208 to ensure getting started guide uses helm charts

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[k8s-ci-robot]

Hi @rahulgurnani. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[liu-cong]

/ok-to-test

[liu-cong]

/lgtm

[liu-cong]

/lgtm

[liu-cong]

/assign @kfswain

[kfswain]

Small comment but otherwise looks good, thanks!

[liu-cong]

/lgtm

[kfswain]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kfswain, rahulgurnani

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