sass-loader dependency update (Post Vue 3 Migration)

[fergmac]

Describe the task
sass-loader is a webpack plugin that helps us to compile SASS code to CSS. There have been changes in the CSS ecosystem over the last few years that may reduce the value of including SASS as a dependency. Do we still need to use SASS? Nesting and variables are now available using 'vanilla' CSS.

sass-loader: 14.2.1 -> 15.0.0

If we don't need to use SASS we should remove the dependency and update any related SASS (SCSS) code.

Purpose
To update dependencies and clean up dependencies that are no longer needed.

Acceptance Criteria

• The application builds and runs successfully.

Additional context

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