Impl cloudflare wrangler

- Add astro cloudlfare plugin
- Generate cloudflare deploy configs

Signed-off-by: Asai Neko <sugar@sne.moe>

package.json

@@ -10,6 +10,7 @@
         "astro": "astro"
     },
     "dependencies": {
+        "@astrojs/cloudflare": "^12.6.12",
         "@astrojs/mdx": "^4.3.12",
         "@astrojs/starlight": "^0.37.0",
         "astro": "^5.6.1",