Fix Issues with cloudformation stack

[skimo1337]

I faced some issues in using the cloudformation template, the following changes fixed them on my end

Changes:

🔐 Updated S3 bucket configuration to use modern permission model with OwnershipControls and PublicAccessBlockConfiguration (ACL is failing)
🚀 Upgraded Lambda runtimes from nodejs14.x to nodejs20.x for both functions
🌐 Added 404 error page handling in CloudFront distribution

Technical Details:

• S3 changes address the "Bucket cannot have ACLs set with ObjectOwnership's BucketOwnerEnforced setting" error
• Lambda runtime updates resolve the deprecation of Node.js 14.x
• CloudFront error handling now properly configures both ResponseCode and ResponsePagePath

Deployment Note:
⚠️ Template must be deployed in us-east-1 region due to Lambda@Edge requirements.