[TASK] Rebrush DocHeader: "I am content, not topbar"

Recolor DocHeader, funcmenu and pagetree. Adapt to current
monochrome color scheme where topar is content - not topbar.

Resolves: #62385
Releases: master
Change-Id: I6ef04551950b46372b7bb85c7ef60c1c7fb98af8
Signed-off-by: Ingo Pfennigstorf <i.pfennigstorf@gmail.com>
Reviewed-on: http://review.typo3.org/33445
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>
Tested-by: Thorsten Griebenow <griebenow@alltagsaesthetisierung.de>
Reviewed-by: Felix Kopp <felix-source@phorax.com>
Tested-by: Felix Kopp <felix-source@phorax.com>