[Development] Changed Branding on doc-snapshots.qt.io

[David Redondo]

Hi,

while looking at the What's new for 6.9 I noticed that doc-snapshots.qt.io 
changed branding to "Qt Group" instead of "Qt" (logo and colors, and some 
style changes in the sidebar).
For example compare 
https://doc-snapshots.qt.io/qt6-dev/whatsnew68.html
to 
https://doc.qt.io/qt-6/whatsnew68.html
According to the wayback machine this must have changed after September
where it still looked "normal"
https://web.archive.org/web/20240930220840/https://doc-snapshots.qt.io/qt6-dev/whatsnew68.html

Is this change intentional and if so what are the reasons? To me at least it 
appears that this is a "Qt" page and not a "Qt Group" one.

David