refactor: recommend project references over single extends in root tsconfig (#139)

tsconfig.json

@@ -1,3 +1,9 @@
 {
-  "extends": "./.nuxt/tsconfig.json"
+  "references": [
+    { "path": "./.nuxt/tsconfig.app.json" },
+    { "path": "./.nuxt/tsconfig.server.json" },
+    { "path": "./.nuxt/tsconfig.shared.json" },
+    { "path": "./.nuxt/tsconfig.node.json" }
+  ],
+  "files": []
 }