Add midjourney-proxy setup guide

[ifsheldon]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• 💄 style
• 🔨 chore
• 📝 docs

🔀 变更说明 | Description of Change

新增部署 midjourney-proxy 的中英文指南

📝 补充信息 | Additional Information

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Name	Status	Preview	Comments	Updated (UTC)
chat-plugin-midjourney	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 19, 2024 8:27am

[lobehubbot]

👍 @ifsheldon


Thank you for raising your pull request and contributing to our Community
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[lobehubbot]

❤️ Great PR @ifsheldon ❤️


The growth of project is inseparable from user feedback and contribution, thanks for your contribution!\

项目的成长离不开用户反馈和贡献，感谢您的贡献! 如果您对 LobeHub 开发者社区感兴趣，请加入我们的 discord，然后私信 @arvinxx 或 @canisminor1990。他们会邀请您加入我们的私密开发者频道。我们将会讨论关于 Lobe Chat 的开发，分享和讨论全球范围内的 AI 消息。

[lobehubbot]

🎉 This PR is included in version 1.3.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀