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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7d8f988522ed by Victor Stinner in branch 'default':
Issue #23951: remove devguide_theme_revised.patch
https://hg.python.org/devguide/rev/7d8f988522ed

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