Dataset v3 (#1412)

Co-authored-by: Simon Alibert <75076266+aliberts@users.noreply.github.com>
Co-authored-by: Remi Cadene <re.cadene@gmail.com>
Co-authored-by: Tavish <tavish9.chen@gmail.com>
Co-authored-by: fracapuano <francesco.capuano@huggingface.co>
Co-authored-by: CarolinePascal <caroline8.pascal@gmail.com>

docs/source/_toctree.yml

@@ -19,6 +19,8 @@
     title: Train RL in Simulation
   - local: async
     title: Use Async Inference
+  - local: porting_datasets_v3
+    title: Porting Large Datasets
   title: "Tutorials"
 - sections:
   - local: smolvla