Add keda documentation Docker image to helm-www repo

[tomerle03]

Hi,
I am working in an air gapped environment and I've wanted to deploy this docs so I made a docker image that's serve this docs in port 8080:

docker.io/tomerle03/keda-docs:v2.13

I hope we can collaborate and you will add this image to your repo README.

[stale]

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