Removed directories mcd function and aliases.

lib/directories.zsh

@@ -34,11 +34,3 @@ cd () {
   fi
 }
 
-alias md='mkdir -p'
-alias rd=rmdir
-alias d='dirs -v'
-
-# mkdir & cd to it
-function mcd() { 
-  mkdir -p "$1" && cd "$1"; 
-}