new yarn aliases

'yarn global add' as 'yaga'
'yarn serve' as 'yas'

aliases/available/yarn.aliases.bash

@@ -5,6 +5,7 @@ about-alias 'yarn package manager aliases'
 alias ya='yarn'
 alias yai='yarn init'
 alias yaa='yarn add'
+alias yaga='yarn global add'
 alias yaad='yarn add --dev'
 alias yau='yarn upgrade'
 alias yarm='yarn remove'
@@ -14,6 +15,7 @@ alias yap='yarn publish'
 alias yasu='yarn self-update'
 alias yaru='yarn run'
 alias yat='yarn test'
+alias yas='yarn serve'
 alias yacc='yarn cache clean'
 alias yack='yarn check'
 alias yals='yarn list'