Update Astro configuration to switch from Netlify to Node adapter and update dependencies

- Replace Netlify adapter with Node adapter in astro.config.ts for standalone mode.
- Update package.json to reflect the new dependency on @astrojs/node.
- Modify package-lock.json to include updated versions of dependencies and remove Netlify-specific configurations from the contact form.

package.json

@@ -22,7 +22,7 @@
     "fix:prettier": "prettier -w ."
   },
   "dependencies": {
-    "@astrojs/netlify": "^6.1.0",
+    "@astrojs/node": "^9.2.2",
     "@astrojs/react": "^4.2.0",
     "@astrojs/rss": "^4.0.11",
     "@astrojs/sitemap": "^3.2.1",