GitLab

* Link attention docs to the main docs and fix errors reported by Sphinx
Signed-off-by: Przemek Tredak <ptredak@nvidia.com>

* Lower the version of nbsphinx
Signed-off-by: Przemek Tredak <ptredak@nvidia.com>

* More fixes
Signed-off-by: Przemek Tredak <ptredak@nvidia.com>

* Change the URL of example_attention.py to GitHub
Signed-off-by: Przemek Tredak <ptredak@nvidia.com>

* More fixes in the attention tutorial
Signed-off-by: Przemek Tredak <ptredak@nvidia.com>

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Signed-off-by: Przemek Tredak <ptredak@nvidia.com>