(#1) - WebPack bundling of JS and CSS (#1)

This work was done with Claude.

Added bundling of CSS & JS with WebPack. This also means minimization.

---------

Co-authored-by: Martin Slachta <martin.slachta@outlook.com>
Reviewed-on: #1

assets/js/RsvApi.js

@@ -2,6 +2,6 @@
  * Utilities for calling the API
  */
 
-function get_rest_url(resource) {
+export function get_rest_url(resource) {
     return ReservairServiceAPI.restUrl + '/' + resource;
 }