fix: Missing app icons from nix installs

Author: mmstick

etc/profile.d/pop-nix.sh

@@ -0,0 +1,6 @@
+# Enables application icons to appear
+if command -v nix-env > /dev/null; then
+  DEFAULT_PROFILE=/nix/var/nix/profiles/default/share
+  USER_PROFILE=/nix/var/nix/profiles/per-user/${USER}/profile/share
+  export XDG_DATA_DIRS=${DEFAULT_PROFILE}:${USER_PROFILE}:${XDG_DATA_DIRS}
+fi