fix: add insecure registry configuration to containerd when using registry flag; refs #555

[MatthewHehir]

Changes

Unable to pull images from local registry created with --registry

• Adds the missing configuration required to pull images from the local registry iff using the --registry flag.

/kind bug

Fixes #555

Release Note

Kind is now able to pull images from the local registry created using the `--registry` flag.

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[knative-prow]

Welcome @MatthewHehir! It looks like this is your first PR to knative-extensions/kn-plugin-quickstart 🎉

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