Added X11 compositor (picom) and configure background transparancy

dotfiles/desktop/.config/i3/config

@@ -18,6 +18,9 @@ exec --no-startup-id pipewire
 exec --no-startup-id pipewire-pulse
 exec --no-startup-id wireplumber
 
+# Compositor
+exec_always --no-startup-id picom -b
+
 # Monitor configuration
 exec --no-startup-id autorandr --persistent --change
 
@@ -46,6 +49,12 @@ new_window pixel 2
 new_float pixel 2
 hide_edge_borders none
 
+# Gaps (i3 >= 4.22)
+gaps inner 10
+gaps outer 4
+smart_gaps on
+smart_borders on
+
 # vim-like directions
 set $left h
 set $down j