Increase font contrast, use code highlighting theme of golang.org.
Increase font contrast, use code highlighting theme of golang.org.

Resolves #297.

Use green for comments. It's consistent with golang.org and has higher
contrast (against background).

Use slightly darker black for code. It's consistent with golang.org and
has higher contrast.

jmhodges/gddo,jeweljar/gddo,gdey/gddo,nickrobinson/gddo,makhov/gddo,landaire/gddo,andrewstuart/gddo,jmhodges/gddo,jeweljar/gddo,chilts/gddo,makhov/gddo,marcusolsson/gddo,nickrobinson/gddo,sourcegraph/gddo,rjeczalik/gddo,SDGophers/gddo,andrewstuart/gddo,shopkeep/gddo,tomheng/gddo,gdey/gddo,nickrobinson/gddo,landaire/gddo,margaery/gddo,SDGophers/gddo,makhov/gddo,sourcegraph/gddo,tomheng/gddo,sourcegraph/gddo,golang/gddo,rjeczalik/gddo,margaery/gddo,andrewstuart/gddo,golang/gddo,jeweljar/gddo,margaery/gddo,shopkeep/gddo,golang/gddo,landaire/gddo,andrewstuart/gddo,tomheng/gddo,marcusolsson/gddo,segmentio/gddo,jmhodges/gddo,segmentio/gddo,jmhodges/gddo,gdey/gddo,landaire/gddo,jeweljar/gddo,segmentio/gddo,makhov/gddo,chilts/gddo,tomheng/gddo,gdey/gddo,margaery/gddo,chilts/gddo,chilts/gddo,sourcegraph/gddo,SDGophers/gddo,SDGophers/gddo,segmentio/gddo,rjeczalik/gddo,nickrobinson/gddo,marcusolsson/gddo,marcusolsson/gddo,golang/gddo,shopkeep/gddo,shopkeep/gddo,rjeczalik/gddo