feat: add QR code generator and Nostr event handling

- Added the `simplesoftwareio/simple-qrcode` package to the project
- Created a new JavaScript file `nostrZap.js` to handle Nostr events
- Added the `nostrZap` function to the Alpine.js data property in `app.js`
- Updated the `services.php` configuration file to include the `nostr` environment variable
- Created a new database migration to add a `payment_event` field to the `einundzwanzig_plebs` table
- Made adjustments in the `Election:year.blade.php` view file to handle potential null values
- Updated `composer.lock` and `package.json` with the new dependencies

package.json

@@ -15,9 +15,11 @@
         "flatpickr": "^4.6.13",
         "laravel-echo": "^1.16.1",
         "laravel-vite-plugin": "^1.0",
+        "nostr-tools": "^2.7.2",
         "postcss": "^8.4.41",
         "pusher-js": "^8.4.0-rc2",
         "tailwindcss": "^3.4.10",
-        "vite": "^5.0"
+        "vite": "^5.0",
+        "webln": "^0.3.2"
     }
 }