Do a CSS sweep to align with latest version of Sass

[MilosPaunovic]

Cooldown period might be a good time to do a full sweep of CSS to align with latest version of Sass, which produces warnings when we remove the artificial silencing of the logger from vite.config.js file:

preprocessorOptions: {
   scss: {
      logger: sass.Logger.silent
   },
}

This should be done in EE repository also.

[elevatebart]

A lot of issues come straight from bootstrap.

twbs/bootstrap#40962 (comment)

They don't want to fix the deprecations. It would remove compatibility with node-sass.
I think we should postpone until they have fixed it.

Let's change one thing though: "only silence the needed warning"

[MilosPaunovic]

Yup, agreed.