tmux: add tk alias to zshrc

Author: izzygomez

zsh/zshrc

@@ -53,8 +53,8 @@ fi
 if is_command_available tmux; then
     # Some useful & opinionated tmux aliases
     alias t='tmux'
-
     alias tl='tmux ls'
+    alias tk='tmux kill-server'
 
     # Create a new tmux session with a blank window in "~"
     alias tmuxnew='tmux new -n "" -c "~" -s'