fix: correct project homepage in krew.yaml

[dareste]

Proposed changes

• Fix wrong URI project in krew.yaml

Checklist

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• I have read the CONTRIBUTING guide
• I have proven my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have ensured the README is up to date
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch on my own fork

[Copilot]

Pull Request Overview

This PR corrects the project homepage URL in the krew.yaml configuration file by updating the GitHub organization from "nginxinc" to "nginx".

• Updates the homepage URL to use the correct GitHub organization
• Aligns the homepage URL with the release download URLs that already use the "nginx" organization

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[mrajagopal]

All good.