feat: install obs on laptop

hosts/common/optional/obs.nix

@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+{
+  programs.obs-studio = {
+    enable = true;
+
+    plugins = with pkgs.obs-studio-plugins; [
+      wlrobs
+      obs-backgroundremoval
+      obs-pipewire-audio-capture
+      obs-gstreamer
+      obs-vkcapture
+    ];
+  };
+}

hosts/nixos/rihla/default.nix

@@ -50,6 +50,7 @@
       "hoppscotch"
       "hyprland"
       "nix-ld"
+      "obs"
       "secure-boot"
       "yubikey"
     ])