zsh: add lsx alias

I thought I had this one before :thinking_face:

.zshrc

@@ -102,6 +102,9 @@
 
    alias tm='tmux new -As0' # open a new session called 0, but if there is already a session called 0, connect to it
 
+   # List avalible X displays. Useful for finding what display to export when connected over ssh.
+   alias lsx='ls /tmp/.X11-unix | tr "X" ":"'
+
    # Edit config files
    alias \
       nvc='(cd ~/.config/nvim/lua/blake && nvim ../../init.lua)' \