[docs] All doc download links seem broken

[Christophe CACHAT]

Dear members of the Python team, 

It seems all the links to download PDF or ePub versions of documentation are broken (tried version 2.7 to 3.7dev without success) either as .zip or .tar.bz2. Only 404 message from nginx.

I used https://docs.python.org/3/download.html from the main https://docs.python.org page "Download these documents”.

Thanks in advance for fixing them, I travel a lot and wanted to have them available offline to work when airline does not offer wifi.

Best regards,

Christophe CACHAT

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