tracCGit version of cgit css

This 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>
Add different highlight css definitions as comments

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