Update readme to exclude artifacts directory

README.md

@@ -93,10 +93,8 @@ with `pip` so that the relative imports work:
 pip install -e .
 ```
 
-The repository is organized in three main directories:
+The repository is organized in two main directories:
 
-- _artifacts_ which contains metrics and other information generated
-  by runs of YOLOv8 or tesseract.
 - _datasets_ which contains all datasets used to train the models or
   for inference. The whole newspaper collection would go in that
   directory.