refactor: Move nix outside of .config dir

Technically not a config but a compose file, so I think it's better to
have outside of `.config` dir

nix/users/ziro/darwin.nix

@@ -0,0 +1,50 @@
+{ pkgs, pkgs-unstable, config, vars, lib, ... }:
+
+{
+  home.homeDirectory = "/Users/ziro";
+  home.packages = lib.mkAfter
+    [
+      pkgs.casks.vscodium
+    ];
+
+  programs.browserpass = {
+    enable = true;
+    browsers = [ "brave" "chrome" ];  # Arc and Chrome share the same `Application Support` dir, not sure why tbh.
+  };
+
+  home.file."Library/Application Support/Floorp/native-messaging-hosts/passff.json".source = "${pkgs.passff-host}/share/passff-host/passff.json";
+
+  # Swap CapsLock with Esc for better vi-mode experience.
+  launchd.agents.CapsEscSwap = {
+    enable = true;
+    config = {
+      ProgramArguments = [
+        "/usr/bin/hidutil"
+        "property"
+        "--set"
+        ''{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x700000039,"HIDKeyboardModifierMappingDst":0x700000029},{"HIDKeyboardModifierMappingSrc":0x700000029,"HIDKeyboardModifierMappingDst":0x700000039}]}''
+      ];
+      RunAtLoad = true;
+    };
+  };
+
+  home.sessionVariables.MOZ_LEGACY_PROFILES = 1;
+
+  home.activation.applications = let
+    env = pkgs.buildEnv {
+      name = "home-applications";
+      paths = config.home.packages;
+      pathsToLink = "/Applications";
+    };
+  in lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    echo "setting up ${config.home.homeDirectory}/Applications..." >&2
+    rm -rf "${config.home.homeDirectory}/Applications/Nix Home Manager Apps"
+    mkdir -p "${config.home.homeDirectory}/Applications/Nix Home Manager Apps"
+    find ${env}/Applications -maxdepth 1 -type l -exec readlink '{}' + |
+      while read src; do
+        app_name=$(basename "$src")
+        echo "copying $src" >&2
+        ${pkgs.mkalias}/bin/mkalias "$src" "${config.home.homeDirectory}/Applications/Nix Home Manager Apps/$app_name"
+      done
+  '';
+}