Remove cluster-template-0.0.1.tgz and index.yaml

[lindhe]

I tried installing this chart in Rancher 2.7.5 after removing the tgz and index files, and it seems like it works fine without them. Therefore, I think they should be removed. Mostly because having a binary fine in Git like that is bad, but also because it will be clearer to the end user what one needs to modify or not when using these examples.

https://github.com/rancher/cluster-template-examples/blob/dc5c201c5415c430cdf4bcb6af975f9e516e970b/cluster-template-0.0.1.tgz

https://github.com/rancher/cluster-template-examples/blob/dc5c201c5415c430cdf4bcb6af975f9e516e970b/index.yaml