nix: add printing, browsers, update

nix/configuration.nix

@@ -91,7 +91,12 @@
   console.keyMap = "de";
 
   # Enable CUPS to print documents.
+  # hardware.sane.enable = true;
   services.printing.enable = true;
+  services.printing.browsing = true;
+  # services.avahi.enable = true;
+  # services.avahi.nssmdns = true;
+  services.printing.drivers = with pkgs; [ gutenprint ];
 
   # Enable sound with pipewire.
   sound.enable = true;
@@ -124,7 +129,7 @@
     packages = with pkgs; [
       firefox
       thunderbird
-      unstable.nextcloud-client
+      nextcloud-client
       qalculate-gtk
       schildichat-desktop
       tdesktop
@@ -135,6 +140,8 @@
       audacity
       gnome.cheese
       unstable.zoom-us
+      qutebrowser
+      evince
     ];
   };
 
@@ -164,10 +171,11 @@
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
-    tldr
+    tealdeer
     gcolor2 # gcolor3 does not work
     vim
     neovim
+    # cups
     wget
     gparted
     emacs