feat(zsh): add `^X^E` mappinng to edit command line in editor

Signed-off-by: Seongmin Lee <[e-mail]>

zsh/.zshrc

···
 
 ## Fzf shell integration
 source <(fzf --zsh)
+
+autoload edit-command-line
+zle -N edit-command-line
+bindkey '^Xe' edit-command-line
+bindkey '^X^E' edit-command-line