docs(ja): translate vscode into Japanese

[sakimyto]

Summary

Partial work of #880 .

• translated ja/reference/vscode.mdx.
• fixed to settings.json instead of biome.json in reference/vscode.mdx.
  • let me know if you'd prefer to separate the PRs.

Test Plan

[unvalley]

Thank you! I left some suggestions but they are nits. We need to update some sentences on the original doc. If you have time, I would like to have it done:)

[sakimyto]

@unvalley
Thank you for your reviews.

Thank you! I left some suggestions but they are nits. We need to update some sentences on the original doc. If you have time, I would like to have it done:)

Is this right?

93522c3

[unvalley]

@sakimyto Yes, Thanks!