Use proper Google Analytics id (#56578)
Summary:
This PR fixes the GA id and relies on `pytorch-sphinx-theme` to set the GA script instead of hard-coding it (this is supported since https://github.com/pytorch/pytorch_sphinx_theme/pull/110 was merged).
Similar PRs were opened and merged in torchchvision/audio/text, e.g.: https://github.com/pytorch/vision/pull/3700
CC brianjo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56578
Reviewed By: mrshenli
Differential Revision: D28199244
Pulled By: ranman
fbshipit-source-id: a20b7fd1b1da3ebff491286c3eeb1410f3c80670
