Fix build site

Author: ota-meshi

package.json

@@ -120,6 +120,7 @@
     "svelte": "^3.37.0",
     "ts-node": "^10.0.0",
     "typescript": "^4.5.2",
+    "vite": "~2.6.12",
     "vite-plugin-svelte-md": "^0.1.3",
     "vue-eslint-editor": "^1.1.0",
     "vue-eslint-parser": "^8.0.0",