hosts/main: move wireplumber configuration to git

hosts/main/wireplumber/51-digital-output.conf

@@ -0,0 +1,10 @@
+monitor.alsa.rules = [{
+    matches = [{
+        node.name = "alsa_output.pci-0000_00_1f.3.iec958-stereo"
+    }]
+    actions = {
+        update-props = {
+            node.description = "Digital Output"
+        }
+    }
+}]