refactor and modularize base.nix futher; use default.nix when possible

configuration/base/pipewire.nix

@@ -0,0 +1,35 @@
+{ ... }:
+
+{
+  # Enable sound.
+  # hardware.pulseaudio.enable = true;
+  # OR
+  services.pipewire = {
+    enable = true;
+    pulse.enable = true;
+    extraConfig.pipewire-pulse = {
+      "10-prevent-agc" = {
+        "pulse.rules" = [
+          {
+            matches = [
+              { "application.process.binary" = "chrome"; }
+              { "application.process.binary" = "Discord"; }
+              { "application.process.binary" = "teams"; }
+              { "application.process.binary" = "electron"; }
+              { "application.process.binary" = "skypeforlinux"; }
+              { "application.process.binary" = "telegram-desktop"; }
+              { "application.process.binary" = "vivaldi"; }
+              { "application.process.binary" = "chromium"; }
+              { "application.process.binary" = "zoom"; }
+            ];
+            actions = {
+              quirks = [
+                "block-source-volume"
+              ];
+            };
+          }
+        ];
+      };
+    };
+  };
+}