~setup lock and bg variables in i3

$bg is the background command using feh, and is a random item from the
backgrounds folder

$lock is the i3lock command I use. Uses a png from locksreens folder,
and also sets a colour in case the lockscreen image is not present.

i3.conf

@@ -2,10 +2,8 @@
 # Please see https://i3wm.org/docs/userguide.html for a complete reference!
 
 set $mod Mod4
-set $lock i3lock --nofork -f -e
-
-# Font for window titles. Will also be used by the bar unless a different font
-# is used in the bar {} block below.
+set $lock i3lock -n -f -e -i ~/Pictures/Lockscreens/mountain.png -c 555555
+set $bg feh --randomize --bg-scale ~/Pictures/Backgrounds
 font pango:Waree 9
 
 # xss-lock grabs a logind suspend inhibit lock and will use i3lock to lock the
@@ -183,5 +181,5 @@ bar {
         font pango:Arial 9.5
 }
 
-exec --no-startup-id feh --randomize --bg-scale ~/Pictures/Backgrounds
+exec --no-startup-id $bg
 exec rofi -show run -matching fuzzy daemon