Impl prettier to project

- Add prettier json config
- Format project with prettier config
- Enable prettier in zed project settings

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

.zed/settings.json

@@ -4,6 +4,8 @@
 // see the documentation: https://zed.dev/docs/configuring-zed#settings-files
 
 {
+  "format_on_save": "on",
+  "formatter": "prettier",
   "languages": {
     "TypeScript": {
       "language_servers": [