[pl] update: docs/home/_index.md

[dkarczmarski]

• update the menu section
• add a missing button "See available versions"

https://kubernetes.slack.com/archives/C0191RDKHU1/p1738917120280889

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[mfilocha]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 3d5c1a166239cb9625e9570bdef603eb007d43d1

[k8s-ci-robot]

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