Restore legacy book linking sound

src/main/resources/assets/rivencraft/sounds.json

@@ -0,0 +1,10 @@
+{
+  "linking.link": {
+    "category": "player",
+    "sounds": [
+      {
+        "name": "rivencraft:linking/link"
+      }
+    ]
+  }
+}