Change persistence.dataDir.storageClass to persistence.dataDir.storageClassName

The documentation in the values.yaml under persistence use the boilerplate text

https://github.com/itzg/minecraft-server-charts/blob/30076e538c67e5c8b256c61aa8c1cb9f57fb4814/charts/minecraft/values.yaml#L271-L285

Which indicates that to use a storageClass you should use storageClassName. This is inline with many other charts and the value in a PVC definition. However the template uses storageClass instead of storageClassName. I didn't find this until I looked at the template itself and the deployment used a local-path instead of my specified storageclass

https://github.com/itzg/minecraft-server-charts/blob/30076e538c67e5c8b256c61aa8c1cb9f57fb4814/charts/minecraft/templates/datadir-pvc.yaml#L26-L30

Either the documentation in README.md and the values.yaml should be updated, or better the general standard should be followed and use storageClassName

Start with charts/minecraft/values.yaml lines 271-285 and templates/datadir-pvc.yaml lines 26-30, then check the README references to the same setting. Verify how the chart renders the PVC when a storage class is configured; done means the documented key and rendered PVC behavior agree with the intended storage class.

Written by the indexing model from the issue text.