Update bulma template to match version 1.x documentation

[geeknees]

This PR updates the bulma template to align with the current documentation for version 1.x. Adjustments have been made to ensure compatibility with the updated styles and components as specified in the latest version.

• By changing @import to @use, the warning below is resolved.

Deprecation Warning [import]: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

More info and automated migrator: https://sass-lang.com/d/import

   ╷
39 │ @import 'bulma/bulma';
   │         ^^^^^^^^^^^^^
   ╵
    app/assets/stylesheets/application.bulma.scss 39:9  root stylesheet

• I am updating the customized template based on the latest information from the official site, since the old template causes an error.
  https://bulma.io/documentation/customize/with-modular-sass/