Fix dataset path

[agalbachicar]

🦟 Bug fix

Fixes #16

Summary

This PR introduces 2 changes:

• Moves the LD_LIBRARY_PATH variable to the entrypoint.sh script when using NVidia Omniverse Isaac and avoids a potential warning or wrong setting.
• Mutates the DATASET_PATH to DATASET_NAME which produces a warning (documented in the README) but not an error when not set.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[ndelima-ekumen]

LGTM