robots.txt: disallow non-latest docs torchx/torchelastic #1150
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This disables versioned pages for the docs from being indexed in search engines.
There's a lot of old versioned pages that have been indexed by Google such as https://pytorch.org/elastic/0.1.0rc2/overview.html when the new location is in core for torchelastic. This prevents users from being confused by old documentation pages.
The pattern of Disallow: *, Allow: foo works per https://technicalseo.com/tools/robots-txt/
Test plan:
Use https://technicalseo.com/tools/robots-txt/