Add google collab link for gallery examples (#7843)

Author: NicolasHug

.github/workflows/docs.yml

@@ -55,6 +55,13 @@ jobs:
         # cores (`-j auto`). Thus, we limit to a single process (`-j 1`) here.
         sed -i -e 's/-j auto/-j 1/' Makefile
         make html
+
+        mkdir build/html/_generated_ipynb_notebooks
+        for file in `find build/html/_downloads`; do
+          if [[ $file == *.ipynb ]]; then
+            cp $file build/html/_generated_ipynb_notebooks/
+          fi
+        done
         
         cp -r build/html "${RUNNER_ARTIFACT_DIR}"
         

gallery/plot_datapoints.py

@@ -3,6 +3,8 @@
 Datapoints FAQ
 ==============
 
+https://colab.research.google.com/github/pytorch/vision/blob/gh-pages/_generated_ipynb_notebooks/plot_datapoints.ipynb
+
 Datapoints are Tensor subclasses introduced together with
 ``torchvision.transforms.v2``. This example showcases what these datapoints are
 and how they behave.