pygments: update css for Pygments 2.2.0

Most of kallithea/public/css/pygments.css was created with Pygments 1.4 and a command like

pygmentize -S default -f html | sed 's/^\(.*\) { /.code-highlight \1, .codehilite \1 { /g' > kallithea/public/css/pygments.css

Now, the minimum supported version is 1.5 and the latest available version is 2.2.0 .

Recreate the file with latest version, Pygments 2.2.0 .