i18n(ja): Add guides/migrate-to-astro/from-docusaurus.mdx

[jp-knj]

Description (required)

Add missing Japanese translation
This improves completeness of the Japanese docs and aligns them with the latest English source.

original source: https://github.com/withastro/docs/blob/main/src/content/docs/en/guides/migrate-to-astro/from-docusaurus.mdx

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• Suggested label: i18n

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[yanthomasdev]

We are missing the note block at the end of Community Resources, could you add it to the translation? Thanks!

[yanthomasdev]

Looks like a few of the migration guide translations had type: migration in the frontmatter indented, when it shouldn't, so the section in the end with links to other migration guides wasn't showing up. Could you take a look at your merged translations and fix that in them? And add that note block in the end if I missed that in any previous translations. Thanks!

[yanthomasdev]

LGTM! Thanks!