Improve Volumes concept page

[sftim]

This is a Feature Request

Improve Volumes page
See #31159

What would you like to be added

• Move long lists of volume types to the reference section - see Move volume types into reference section #42590
• Explain what volumes are in Kubernetes.

Why is this needed

We want people to easily learn about storage

Comments
/sig storage

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[Zerotay]

Hello, thanks for improving Volume document.
It is helpful to me for understanding what volumes of Kubernetes is.

I saw the issue #42590, and I think this idea is also great.

Since volumes are important to users because of their persistence and shared storage, it would be helpful to reorder the list of volume types.
Instead of simply sorting alphabetically, I think it would be better to categorize the volumes into two main categories: ephemeral volumes (volumes that share the lifecycle with the pod) and persistent volumes (volumes with a lifecycle independent of the pod), and then sort them.
From the perspective of users utilizing the volumes, whether the persistence of the volume is guaranteed is an important consideration, so I believe this classification would be helpful to users.

[sftim]

@Zerotay, consider commenting on #42590 instead.