* feat: make Carbon themed variables globally available
* feat: use gray from theme palette
* refactor: move checkbox styles to separate file
* refactor: use Carbon palette instead of `$white`
* refactor: use Carbon text style `$text-02`
* feat: use Carbon tokens in "metal" page
* refactor: include copy styles globally
* refactor: use Carbon color tokens
* refactor: define semantic variables
* fix: use Carbon's "cool gray 20" in grid bg
Closes#1366
Eddybrando Vásquez