docs-util: fixes following packages reorg (#9326)

- Typescript config aren't picked up properly anymore since they're moved to `_tsconfig.base.json` in the root. So, we now read the config from the config file.
- Update Typescript version in the `utils` monorepo to match that of the root monorepo

www/utils/packages/react-docs-generator/package.json

@@ -24,7 +24,7 @@
     "ts-node": "^10.9.1",
     "typedoc": "^0.26.2",
     "typedoc-plugin-custom": "*",
-    "typescript": "5.5",
+    "typescript": "^5.6.2",
     "utils": "*"
   },
   "devDependencies": {