Bugfix/pg connections (#2002)

* increase max_connections to 150 in all docker files

* lower celery worker concurrency to 6

deployment/kubernetes/postgres-service-deployment.yaml

@@ -40,6 +40,7 @@ spec:
             secretKeyRef:
               name: danswer-secrets
               key: postgres_password
+        args: ["-c", "max_connections=150"]
         ports:
         - containerPort: 5432
         volumeMounts: