update css to latest status of cgit (v0.9.2-21-gd62e71a)

Like the previous css update, this (still) is an incompatible change,
so you need a recent cgit version installed.
The cgit change is in v0.9.1-49-gb60e6bf

For compatibility, the previous definitions are kept.

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>