feat(scss-config-webpack-plugin): Replace deprecated Node Sass with Sass

[Nilsilino]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: link tbd.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] tooling / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: 92

What is the new behavior?

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Other information

[ernscht]

It works, thank you. But I would see the change as "breaking".

Since we will have other breaking changes, we can still merge it.