Massive changes for archlinux move

- Add Xft Xresources to make fonts not ugly
- Add dunstrc now that I'm using dunst
- Manage GTK settings now that I'm free of mate-settings
- Add an i3 keybind for pcmanfm
- Make kitty font size chords +/- by 1pt and not 2pt
- Explicitly specify fonts everywhere
- Put barrier and dunst in xinitrc
- Make QT theme explicit via env var
- Move ZSH keybinds to global since Arch doesn't bind them

.config/i3/config

@@ -38,7 +38,7 @@ bar {
   status_command "~/bin/statusbar"
   position bottom
 
-  font pango:Terminus (TTF), Font Awesome 5 Free Regular 12
+  font pango:Terminus (TTF) 12
 
   colors {
     background $base00
@@ -75,6 +75,9 @@ bindsym $mod+Tab exec "rofi -show window"
 # rofi launcher
 bindsym $mod+space exec "rofi -show run"
 
+# pcmanfm -- file manager
+bindsym $mod+Shift+Return  exec "pcmanfm"
+
 # change focus
 bindsym $mod+Left focus left
 bindsym $mod+Down focus down