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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5a19fbb8501f by Zachary Ware in branch 'default':
Issue #23951: Add missing icon
https://hg.python.org/devguide/rev/5a19fbb8501f

New changeset 0f642c1ba901 by Zachary Ware in branch 'default':
Issue #23951: Clean up rstlint makefile integration
https://hg.python.org/devguide/rev/0f642c1ba901

----------

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