More up-to-date image for web pages

"Part of KDE family" logo from https://www.kde.org/stuff/clipart.php,
by Philipp Schmieder:
"I am the original author of those graphics and you may use them
unter the LGPL version 2.1, or version 3 or later versions approved
by the membership of KDE e.V. :-)"

Backport for kdoctools framework.

CCBUG: 342710
REVIEW: 122080