remove unicode from joyous bash

Unicode breaks the pandoc compiler (because LaTeX is shit).

slides/joyous_bash/joyous_bash.md

@@ -23,7 +23,7 @@ echo blacklist pcspkr >  /etc/modprobe.d/nobeep.conf
 
 ```sh
 curl wttr.in
-curl -s wttr.in/Београд
+curl -s wttr.in/
 curl wttr.in/Moon
 ```
 
@@ -150,7 +150,7 @@ set keymap vi
 set editing-mode vi
 set show-mode-in-prompt on
 set vi-ins-mode-string "  "
-set vi-cmd-mode-string " "
+set vi-cmd-mode-string "W "
 set keymap vi
 ```