Add the Sphinx copy-button feature to improve usability when copying code blocks and command examples. Depends-On: I8c367e5f78ac15b28190c1d6788971681c58dacd Change-Id: I83e9d0e4135082060f4d12803bb379ab5b981dbc Signed-off-by: Dmitriy Chubinidze <dcu995@gmail.com>