[Python-Dev] Translated Python documentation

[INADA Naoki]

> Where should these translated docs live and how does one make it clear to
> users reading them that doc bugs shouldn't be submitted to the main bug
> tracker/github repo?
>

We setup github page.  See https://python-doc-ja.github.io/py36/ (note that
version switcher won't work because this html is build for docs.python.jp.)

I reserved "python-docs" organization.  So we can use URL like
https://python-doc.github.io/<lang>/3.6/
(Because the organization name looks "something official", I won't use it
until we get consensus about it.)

For issue tracker, bugs.html must mention about translated document, before
mention to normal issue tracker.