Add some docs describing how to migrate from old volumes to new ones

[djeebus]

No description provided.

[cursor]

PR Summary

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

Overview
Adds docs/volumes/migrate.mdx with a TypeScript copy-volume.mts example (list/connect/create volumes, dual mount, rsync copy).

The new page is not listed under the Volumes group in docs.json, so it may not show in the docs nav. Unlike sibling pages such as docs/volumes/manage.mdx, this file has no frontmatter title. The Sources link points at JS SDK v1.13.0 sandbox reference, which may not match current volume SDK usage elsewhere in the docs.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Missing MDX frontmatter description

Low Severity

The new page docs/volumes/migrate.mdx has no YAML frontmatter and no description: field. New MDX pages under docs/ need a one-sentence description in frontmatter for meta tags and search/LLM summaries, like the other volume guides use for title.

 

^{Triggered by learned rule: New MDX doc pages must include description in frontmatter}

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