docs: use github release link for get started page

[ComradeProgrammer]

docs: use github release link for get started page

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ComradeProgrammer
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[k8s-ci-robot]

@ComradeProgrammer: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-minikube-build	8f03f38	link	true	/test pull-minikube-build

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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