build(deps-dev): bump node-sass from 5.0.0 to 6.0.0 in /html (#670)

build(deps-dev): bump node-sass from 5.0.0 to 6.0.0 in /html (#670)

Bumps [node-sass](https://github.com/sass/node-sass) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v5.0.0...v6.0.0)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>