docs(dataset): add dataset v3 documentation (#1956)

* add v3 doc

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix

* update changes

* iterate on review

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* add changes

* create dataset section

* Update docs/source/lerobot-dataset-v3.mdx

Signed-off-by: Francesco Capuano <74058581+fracapuano@users.noreply.github.com>

* Update docs/source/lerobot-dataset-v3.mdx

Signed-off-by: Francesco Capuano <74058581+fracapuano@users.noreply.github.com>

* Update docs/source/lerobot-dataset-v3.mdx

Signed-off-by: Francesco Capuano <74058581+fracapuano@users.noreply.github.com>

---------

Signed-off-by: Francesco Capuano <74058581+fracapuano@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Michel Aractingi <michel.aractingi@huggingface.co>
Co-authored-by: Francesco Capuano <74058581+fracapuano@users.noreply.github.com>

docs/source/_toctree.yml

@@ -19,9 +19,13 @@
     title: Train RL in Simulation
   - local: async
     title: Use Async Inference
+  title: "Tutorials"
+- sections:
+  - local: lerobot-dataset-v3
+    title: Using LeRobotDataset
   - local: porting_datasets_v3
     title: Porting Large Datasets
-  title: "Tutorials"
+  title: "Datasets"
 - sections:
   - local: smolvla
     title: Finetune SmolVLA