M nixos/README.md → nixos/README.md

@@ -6,6 +6,9 @@
 # remove old generations
 sudo nix-env --profile /nix/var/nix/profiles/system --delete-generations 9 10 11 12 13 X...
 
+# remove old generations except the last 5 generations
+sudo nix-env --profile /nix/var/nix/profiles/system --delete-generations +5
+
 
 # to remove old programs
 nix-collect-garbage --delete-old

M nixos/common-configuration.nix → nixos/common-configuration.nix

@@ -50,6 +50,7 @@ xfce.ristretto
 	xfce.tumbler # for thumbnails of imgs
 	pavucontrol
 	jq
+	keynav
 
 	# other
 	mpv