docs: link newtype Workstation Beta 2

[newtype-01]

更新内容

• 将英文 README 的 newtype Workstation 下载链接从 Beta 1 更新为 Beta 2
• 同步更新中文 README

验证

• Beta 2 Release 已公开
• DMG 公开下载大小为 62,241,734 字节
• SHA-256 为 de222f3db5b0e96a1762c4180f293d1c3c5bb18ff52713e5ae535158bb17e6c8

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