Bump node-sass from 4.14.1 to 8.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 8.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.14.1...v8.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -39,7 +39,7 @@
     "enzyme-adapter-react-16": "^1.15.7",
     "html-webpack-plugin": "^4.5.0",
     "marked": "^2.0.3",
-    "node-sass": "^4.14.1",
+    "node-sass": "^8.0.0",
     "pretty": "^2.0.0",
     "raven-js": "^3.27.2",
     "react": "^16.14.0",