Doc: Add manufacturer information to Product Information page

List the name, postal address, email address, and website of the
manufacturer, as well as the Qt trademarks, as required by CRA
Annex II, point 1.

Fixes: QTBUG-151075
Pick-to: 6.12
Change-Id: Ia79d0effea2823a91dd2aa6951146494b33cc844
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>