Move from htop to btop

Kinda nicer & cooler, let's see if it works.

dotfiles/config/i3/config

 bindsym $mod+Shift+e        exec "$spn pybmo menu uemoji"
 bindsym $mod+z              exec "$spn pybmo menu zk"
 bindsym $mod+Shift+z        exec "$spn pybmo menu zkxx"
-bindsym $mod+period         exec "htopnow"
+bindsym $mod+period         exec "btopnow"
 bindsym $mod+x              exec "mousepad"
 bindsym $mod+slash          exec "pavunow"
 bindsym XF86Calculator      exec "twinner ipython3"