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

[Carol Willing]

New submission from Carol Willing:

It would be helpful to update the conf.py file and dependencies to use a modified 'pydoctheme' for the devguide style. The benefits would be improved readability, a consistent look with the stdlib docs, and collapsible sidebars.

Attached is a screenshot of a quick hack of the conf.py file and the rendered devguide index.

----------
components: Devguide
files: Screen Shot 2015-04-14 at 12.42.48 PM.png
messages: 240943
nosy: ezio.melotti, willingc
priority: normal
severity: normal
status: open
title: Update devguide style to use a similar theme as Docs
type: enhancement
Added file: http://bugs.python.org/file38995/Screen Shot 2015-04-14 at 12.42.48 PM.png

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