added signal desktop client

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/1aabb0a31b25ad83cfaa37c3fe29053417cd9a0f' (2023-11-21)
  → 'github:nix-community/home-manager/134deb46abd5d0889d913b8509413f6f38b0811e' (2023-11-22)
• Updated input 'nixpkgs-stable':
    'github:NixOS/nixpkgs/f836f3712413609fa9b2c548e50cc4fb42ef99aa' (2023-11-21)
  → 'github:NixOS/nixpkgs/9ba29e2346bc542e9909d1021e8fd7d4b3f64db0' (2023-11-23)
• Updated input 'nixvim':
    'github:nix-community/nixvim/0883bab1aba5944d19ee4c3f2c546cf8f3c79a0d' (2023-11-21)
  → 'github:nix-community/nixvim/578b1acc719f08e895c5219f3d8f82e299344a0e' (2023-11-23)

flake.lock

@@ -159,11 +159,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1700553346,
-        "narHash": "sha256-kW7uWsCv/lxuA824Ng6EYD9hlVYRyjuFn0xBbYltAeQ=",
+        "lastModified": 1700695018,
+        "narHash": "sha256-MAiPLgBF4GLzSOlhnPCDWkWW5CDx4i7ApIYaR+TwTVg=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "1aabb0a31b25ad83cfaa37c3fe29053417cd9a0f",
+        "rev": "134deb46abd5d0889d913b8509413f6f38b0811e",
         "type": "github"
       },
       "original": {
@@ -229,11 +229,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1700608871,
-        "narHash": "sha256-LcwDK1xxe3ojR2mD4bV18Btsm9zDwWxrynqyfQORifg=",
+        "lastModified": 1700748986,
+        "narHash": "sha256-/nqLrNU297h3PCw4QyDpZKZEUHmialJdZW2ceYFobds=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f836f3712413609fa9b2c548e50cc4fb42ef99aa",
+        "rev": "9ba29e2346bc542e9909d1021e8fd7d4b3f64db0",
         "type": "github"
       },
       "original": {
@@ -363,11 +363,11 @@
         "pre-commit-hooks": "pre-commit-hooks"
       },
       "locked": {
-        "lastModified": 1700574199,
-        "narHash": "sha256-vMwrbliE2tnQPdPtxiSFpHPEfMrp+zwccd9TPo/PXno=",
+        "lastModified": 1700753867,
+        "narHash": "sha256-iXhVvsMoQ0jo7eh4NorJTCy1nUjjF+P8HGVCndtEhHA=",
         "owner": "nix-community",
         "repo": "nixvim",
-        "rev": "0883bab1aba5944d19ee4c3f2c546cf8f3c79a0d",
+        "rev": "578b1acc719f08e895c5219f3d8f82e299344a0e",
         "type": "github"
       },
       "original": {

home.nix

@@ -56,6 +56,7 @@ let
       # Gui application
       pkgs-stable.darktable # RAW processing
       pkgs-stable.dbeaver   # SQL management tool
+      pkgs-stable.dragon        # simple audio player
                   firefox   # Internet access
                   freerdp   # RDP client
       pkgs-stable.flameshot   # screenshot utility
@@ -71,8 +72,8 @@ let
       pkgs-stable.obsidian      # Markdown and notes
                   qalculate-gtk # unit-friendly calculator
                   qlcplus       # LED xlr control program
+      signal-desktop            # secure messaging service
       pkgs-stable.vscodium      # when vim and emacs (somehow) isn't enough
-      pkgs-stable.dragon        # simple audio player
                   obs-studio    # for video recording and virtual camera