ci: remove example/.nvmrc (#8)

Author: MinhOmega

.github/workflows/deploy-gh-page.yml

@@ -25,7 +25,8 @@ jobs:
       - name: Setup Node.js ⚙️
         uses: actions/setup-node@v4
         with:
-          node-version-file: 'example/.nvmrc'
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org/'
 
       - name: Cache dependencies ⚡
         id: cache_dependencies