chore: add prettier astro config

prettier.config.mjs

@@ -7,6 +7,15 @@ const config = {
   tabWidth: 2,
   semi: false,
   singleQuote: true,
+  plugins: ['prettier-plugin-astro'],
+  overrides: [
+    {
+      files: '*.astro',
+      options: {
+        parser: 'astro',
+      },
+    },
+  ],
 }
 
 export default config