refactor: dedup several modules by breaking them out into feature modules

hosts/shared/nixos-pc.nix

@@ -5,14 +5,18 @@
   ...
 }:
 {
-  boot = {
-    loader = {
-      systemd-boot.enable = true;
-      efi.canTouchEfiVariables = true;
-      systemd-boot.configurationLimit = 10;
-      timeout = 0;
-    };
+  imports = [
+    ../../features/bash.nix
+    ../../features/nix-ld.nix
+    ../../features/docker.nix
+    ../../features/vim.nix
+    ../../features/avahi.nix
+    ../../features/systemd-boot.nix
+    ../../features/i18n.nix
+    ./nix-package-manager.nix
+  ];
 
+  boot = {
     consoleLogLevel = 3;
 
     kernelParams = [
@@ -116,13 +120,6 @@
 
     openssh.enable = true;
     affinity-thumbnailer.enable = true;
-
-    # Enables m(ulticast)DNS (a.k.a. Bonjour) support.
-    avahi = {
-      enable = true;
-      nssmdns4 = true;
-      openFirewall = true;
-    };
   };
 
   networking = {
@@ -131,10 +128,7 @@
     networkmanager.plugins = with pkgs; [ networkmanager-openvpn ];
 
     firewall = {
-      trustedInterfaces = [
-        "virbr0"
-        "br0"
-      ];
+      allowedTCPPorts = [ 22 ];
 
       allowedTCPPortRanges = [
         {
@@ -149,132 +143,24 @@
           to = 1764;
         } # KDE Connect
       ];
-
-      allowedTCPPorts = [ 22 ];
-    };
-  };
-
-  time.timeZone = "America/New_York";
-
-  i18n = {
-    defaultLocale = "en_US.UTF-8";
-
-    extraLocales = [
-      "ja_JP.UTF-8/UTF-8"
-    ];
-
-    extraLocaleSettings = {
-      LC_ADDRESS = "en_US.UTF-8";
-      LC_IDENTIFICATION = "en_US.UTF-8";
-      LC_MEASUREMENT = "en_US.UTF-8";
-      LC_MONETARY = "en_US.UTF-8";
-      LC_NAME = "en_US.UTF-8";
-      LC_NUMERIC = "en_US.UTF-8";
-      LC_PAPER = "en_US.UTF-8";
-      LC_TELEPHONE = "en_US.UTF-8";
-      LC_TIME = "en_US.UTF-8";
     };
   };
 
   security.rtkit.enable = true;
 
   programs = {
+    ssh.startAgent = true;
+    firefox.enable = true;
+
     gnupg.agent = {
       enable = true;
       pinentryPackage = pkgs.pinentry-qt;
     };
 
-    nix-ld = {
-      enable = true;
-      libraries = with pkgs; [
-        stdenv.cc.cc.lib
-        openssl
-        zlib
-        icu
-        curl
-        libxcrypt-legacy
-        gcc
-        pkg-config
-        busybox
-        libdrm
-        mesa
-        libxkbcommon
-        fontconfig
-        libglvnd
-        freetype
-        libxcb
-        libx11
-        libice
-        libsm
-        libxcursor
-        libxrandr
-        libxft
-        skia
-        dotnet-sdk
-        dotnet-runtime
-        dotnet-runtime_8
-        dotnet-runtime_10
-      ];
-    };
-
-    bash = {
-      enable = true;
-
-      interactiveShellInit = ''
-        eval "$(jump shell)"
-        bind -x '"\eOQ": clear;fastfetch'
-      '';
-    };
-
-    starship = {
-      enable = true;
-
-      settings = {
-        character = {
-          success_symbol = "[λ](bold green)";
-          error_symbol = "[λ](bold red)";
-        };
-      };
-    };
-
-    ssh.startAgent = true;
-
-    firefox.enable = true;
-    thunderbird.enable = true;
-
     appimage = {
       enable = true;
       binfmt = true;
     };
-
-    neovim = {
-      enable = true;
-      defaultEditor = true;
-      vimAlias = true;
-
-      configure = {
-        customRC = ''
-          set nocompatible
-          set backspace=indent,eol,start
-          set tabstop=2
-          set shiftwidth=2
-          set expandtab
-        '';
-
-        packages.myPlugins = with pkgs.vimPlugins; {
-          start = [
-            vim-lastplace
-            vim-nix
-          ];
-
-          opt = [ ];
-        };
-      };
-    };
-  };
-
-  virtualisation = {
-    docker.enable = true;
   };
 
   users.users.frank = {
@@ -293,8 +179,6 @@
   };
 
   nixpkgs = {
-    config.allowUnfree = true;
-
     # Fix msitools compiling and failing it's test-suite.
     overlays = [
       (final: prev: {
@@ -307,28 +191,6 @@
     ];
   };
 
-  nix = {
-    gc = {
-      automatic = true;
-      dates = "weekly";
-      options = "--delete-older-than 30d";
-    };
-
-    optimise = {
-      automatic = true;
-      dates = "weekly";
-    };
-
-    settings = {
-      experimental-features = [
-        "nix-command"
-        "flakes"
-      ];
-
-      use-xdg-base-directories = true;
-    };
-  };
-
   environment = {
     systemPackages = with pkgs; [
       wget
@@ -355,7 +217,6 @@
       affinity-v3
       libreoffice-qt
       qimgv
-      fastfetch
       vorta
       distrobox
       devenv