consistently use <nav> instead of <div> for .navbar in docs
Merge pull request #14406 from twbs/nav-tag-for-navbar

consistently use <nav> instead of <div> for .navbar in docs
Ukrainian site migrates to twbs.docs.org.ua
Merge pull request #14433 from KostyaTretyak/patch-1

Ukrainian site migrates on twbs.docs.org.ua