add "konnectivity" to readme or repo tags for SEO

[BenTheElder]

It's hard to go from the kubernetes website docs (https://kubernetes.io/docs/tasks/extend-kubernetes/setup-konnectivity/) to finding this repo, searching konnectivity doesn't bring it up, even though konnectivity is much more "googleable" than say, "KIND" 🙃

we should also consider adding a link back to the repo from k/website docs

[jkh52]

/assign

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/lifecycle stale