Clean up Helm directory and update documentation

- Removed deprecated chart files from helm/ root directory
- Updated all Helm documentation to reference warehouse13 chart
- Changed database name from 'datalake' to 'warehouse13' in values.yaml
- Updated helm command examples in SUMMARY.md
- Fixed migration instructions in helm/README.md
- Updated PostgreSQL backup/restore commands with correct database name

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/SUMMARY.md

@@ -164,7 +164,7 @@ curl -X POST "http://localhost:8000/api/v1/artifacts/query" \
 make deploy
 
 # Or directly with Helm
-helm install datalake ./helm --namespace datalake --create-namespace
+helm install warehouse13 ./helm/warehouse13 --namespace warehouse13 --create-namespace
 ```
 
 ## Feature Flags Usage
@@ -190,9 +190,8 @@ AWS_REGION=us-east-1
 S3_BUCKET_NAME=your-bucket
 
 # Deploy
-helm install datalake ./helm \
-  --set config.deploymentMode=cloud \
-  --set aws.enabled=true
+helm install warehouse13 ./helm/warehouse13 \
+  --set global.deploymentMode=cloud
 ```
 
 ## What's Next