🌱 chore: update the asciinema demo creation script

[wazery]

This is a PR to address the issue #4552 which enhances the current script that creates the asciinema demo recording, by having a minimal makefile target that generates the new recording and updates the root readme file.

I also added a minimal script that sets up a minimal demo kind cluster so we can deploy into.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @wazery. Thanks for your PR.

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[wazery]

Not really sure if we need to start with it tbh.

[wazery]

I checked the Makefile if we have some targets that just creates the needed kind cluster for testing, but I saw it's tightly coupled in the test scripts, so thought of introducing this minimal script just for the demo.

I feel my reasoning is not good here, and it would be nicer if I just decoupled the kind cluster creation from the test scripts, yet it's outside the scope of this PR 🤔 .. just thinking outloud 😅