Added doc on dev-slim (#2627)

Added doc on dev-slim

### Type of change

- [x] Documentation Update
- [x] Refactoring

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

rag/settings.py

@@ -14,6 +14,7 @@
 #  limitations under the License.
 #
 import os
+import logging
 from api.utils import get_base_config, decrypt_database_config
 from api.utils.file_utils import get_project_base_directory
 from api.utils.log_utils import LoggerFactory, getLogger
@@ -48,10 +49,16 @@ minio_logger = getLogger("minio")
 s3_logger = getLogger("s3")
 azure_logger = getLogger("azure")
 cron_logger = getLogger("cron_logger")
-cron_logger.setLevel(20)
 chunk_logger = getLogger("chunk_logger")
 database_logger = getLogger("database")
 
+for logger in [es_logger, minio_logger, s3_logger, azure_logger, cron_logger, chunk_logger, database_logger]:
+    logger.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)-15s %(levelname)-8s (%(process)d) %(message)s",
+    )
+
+
 SVR_QUEUE_NAME = "rag_flow_svr_queue"
 SVR_QUEUE_RETENTION = 60*60
 SVR_QUEUE_MAX_LEN = 1024