pull out configuration into separate files

nix/configuration.nix

@@ -13,6 +13,7 @@
 
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;
+  boot.loader.systemd-boot.configurationLimit = 42;
   boot.loader.efi.canTouchEfiVariables = true;
 
   hardware.bluetooth.enable = true;
@@ -51,17 +52,21 @@
   # $ nix search wget
   environment.systemPackages = with pkgs; [
     cachix
+    calibre
     firefox
     inkscape
     p7zip
     plasma-browser-integration
+    slack
     vim
+    vlc
     wget
     xclip
     zathura
     zsh
   ];
 
+  nixpkgs.config.allowUnfree = true;
   nixpkgs.config.firefox.enablePlasmaBrowserIntegration = true;
 
   fonts.fonts = with pkgs; [ fira-code ];
@@ -71,10 +76,12 @@
     allowedTCPPorts = [
       631 # CUPs port for printing
       6881 # port for torrenting
+      8010 # port for VLC to chromecast
     ];
     allowedUDPPorts = [
       631
       6881
+      8010
     ];
   };
   # Or disable the firewall altogether.