docs: link kustomize.io from the README

[locker95]

README didn't surface the project site. One line so people landing on GitHub can get to https://kustomize.io/ without hunting.

Fixes #5654

[kubernetes-prow]

Hi @locker95. 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.

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[saitejabandaru-in]

LGTM! This makes it much easier to find the official site.

[kubernetes-prow]

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