"Fix MongoDB connection timeout on Vercel serverless"

[lnqminh3003]

Reverts #92

[lnqminh3003]

The current issue is the way that we bundle the code and deploy to serverless environment (Vercel).

Vercel expects everything to start from /api/index.ts and handles the build and dependencies automatically. However, your change in /api/index.ts is importing code from outside the /api. It maybe a reason why it breaks the cloud version

I think we have 2 approaches rn:

• update your change to somehow can deploy to Vercel
• change how we deploy to Vercel - change CI/CD pipeline (keep your change - I tried but I failed to do that - must try again)

@rxmox @Lujarios