add material dark and light themes and dmenu theme selection

bspwm/.config/sxhkd/sxhkdrc

@@ -23,8 +23,8 @@ super + semicolon ; {e,f,t}
 super + semicolon ; shift + {h,l,s}
 	{systemctl hibernate,slock,systemctl suspend}
 
-super + F6
-	sh ~/.config/bspwm/commands.sh theme next
+super + {_,shift + }F6
+	sh ~/.config/bspwm/commands.sh {theme next,dmenu_theme}
 
 XF86AudioPlay
 	mpc toggle