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

[R. David Murray]

R. David Murray added the comment:

I think a reasonably consistent look and feel for all our docs is a good thing.  It's a "branding" kind of thing.  Differentiation by color works for me, but really I don't care about differentiating them, myself.  (I actually find it jarring that I don't get a table of contents as the main page, like I do in the rest of our docs.)

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nosy: +r.david.murray

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<http://bugs.python.org/issue23951>
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