doc: Fix asciidoc.css
doc: Fix asciidoc.css

Set the left menu width, otherwise it spans
across the whole page and links under are
not clickable.

gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim