Fix local docs building

[Phlip79]

What does this PR do ?

There is a cookies pop-up that continually opens when building locally. The flag SKIP_PUBLIC_DOCS_FEATURES=true disables this.

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[Phlip79]

/ok to test 4cd7a90

[svcnvidia-nemo-ci]

🔄 Merge queue validation started!

You can track the progress here: https://github.com/NVIDIA/Megatron-LM/actions/runs/24752704392