PR Summary

Low Risk
Documentation-only changes with no runtime or API impact.

Overview
Adds docs/volumes/migrate.mdx with JS/TS and Python examples that list volumes by name, connect or create the destination, mount both on a sandbox, install rsync, and run rsync -a from source to dest. Registers that page in the Volumes section of docs.json.

Adds Mintlify description frontmatter on the volumes overview and the manage, mount, read-write, info, upload, and download pages.

The volumes overview still lists manage, mount, read-write, info, upload, and download but does not link to the new migrate page, unlike the sidebar entry in docs.json.

The migration guide does not say that copying into an existing destination volume merges with current data or that mismatched volume types (only printed via JWT voltype) may be a problem.

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