[TASK] Move css and template files in taskcenter

The removed image is unused since 18-06-2010.

Resolves: #63115
Releases: master
Change-Id: I0d8182e8eeb485d96f7395bd9a30661b8945eea1
Reviewed-on: http://review.typo3.org/34417
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>