maintenance: node update and move to npm workspaces

[ernscht]

PR Type

What kind of change does this PR introduce?

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

Changes

• [chore] update node version, root dev dependencies and move to npm workspaces

Does this PR introduce a breaking change?

[x] Yes
[ ] No

• Removed support for node < 16.13.0
• scss-config-wwebpack-plugin uses now newest sass Use sass instead of node-sass in scss-config-webpack-plugin #92