sync locale/uk/index.md with the original (#1726)
sync locale/uk/index.md with the original (#1726)

Refs: https://github.com/nodejs/nodejs.org/pull/1719#issuecomment-403442481
phillipj/new.nodejs.org,nodejs/new.nodejs.org,nodejs/new.nodejs.org,phillipj/new.nodejs.org,yous/new.nodejs.org,yous/new.nodejs.org