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

[Berker Peksag]

Berker Peksag added the comment:

Can we at least serve images and JS files (py.png -- this gives 404 now, copybutton.js, sidebar.js) from docs.python.org?

It seems like devguide_theme_revised.patch was committed accidentally: https://hg.python.org/devguide/rev/9e7b1bc15ba7#l3.3

The color of a:hover needs to be tweaked here: https://dl.dropboxusercontent.com/u/166024/devguide.png

I'd also delete rstllint.py.

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