chore: higher resolution voucher thumbnails, drop source pdfs

webpack.config.js

@@ -25,7 +25,7 @@ Encore
     .copyFiles([
         {from: './assets/images', to: 'images/[path][name].[hash:8].[ext]'},
         {from: './assets/favicon', to: 'favicon/[path][name].[hash:8].[ext]'},
-        // voucher thumbnails only; the PDFs beside them are source material and not shipped
+        // voucher thumbnails
         {from: './assets/vouchers', to: 'images/vouchers/[path][name].[hash:8].[ext]', pattern: /\.jpg$/},
     ])
 ;