Update notebooks readme with new location for dataset code (#1920)

notebooks/README.md

@@ -1,14 +1,11 @@
-# Notebooks
+# Deprecated
 
-This is a folder with some useful notebooks, all the notebooks have a markdown
-file with the same name (or a README.md if its a single notebook folder)
-explaining what they do.
+This `notebooks` directory is being retired in favour of new dataset
+contributions going to the `data/datasets` directory, following the guidelines
+[here](https://github.com/LAION-AI/Open-Assistant/blob/main/data/datasets/README.md).
+Please do not submit future data notebooks here.
 
-## Contributing
+## Notebooks
 
-Contributing to notebooks and making new notebooks is very welcome. If you do
-so, make sure to make a markdown (.md) file to go with your notebook, it makes
-it easier for people to know what your notebook is about.
-
-Check out the [example notebook](example/) for a reference example you can use
-as a starting point.
+This directory was designed to hold notebooks, primarily for data scraping and
+augmentation.