Use hosted quickstart GIFs

Author: StafaH

docs/source/_static/quickstart/agent-comparison.gif

@@ -38,7 +38,7 @@ Training outputs, including checkpoints, are saved under ``logs/``. Add
 
 .. The quickstart media is generated by tools/docs/media/generate_quickstart.sh.
 
-.. figure:: ../_static/quickstart/task-sampler.gif
+.. figure:: https://download.isaacsim.omniverse.nvidia.com/isaaclab/images/quickstart_task_categories.gif
    :width: 100%
    :align: center
    :alt: Cartpole, G1 locomotion, and Kuka Allegro manipulation tasks running side by side
@@ -133,7 +133,7 @@ All supported RL libraries use ``--checkpoint`` to choose a checkpoint for
 playback. See :doc:`/source/concepts/reinforcement_learning` for the
 complete training and playback reference.
 
-.. figure:: ../_static/quickstart/agent-comparison.gif
+.. figure:: https://download.isaacsim.omniverse.nvidia.com/isaaclab/images/quickstart_simple_agents.gif
    :width: 100%
    :align: center
    :alt: A Franka drawer-opening task controlled by the zero agent, random agent, and a trained policy side by side