[issue23951] Update devguide style to use a similar theme as Docs

[STINNER Victor]

STINNER Victor added the comment:

I like the new style. I don't think that it's a big issue if people come to the /devguide/ by mistake. They should understand quickly their mistake and search for the right documentation.

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23951>
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