[docs] [issue37860] Add netlify deploy preview for docs

[Ashwin Ramaswami]

Change by Ashwin Ramaswami <aramaswamis at gmail.com>:


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keywords: +patch
pull_requests: +15012
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15288

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37860>
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