Bump node-sass from 4.14.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 7.0.0.
- [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...v7.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
...

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

package.json

@@ -39,7 +39,7 @@
     "gulp-terser": "^1.2.0",
     "gulp-watch": "^5.0.1",
     "live-server": "^1.2.1",
-    "node-sass": "^4.14.1",
+    "node-sass": "^7.0.0",
     "npm-run-all": "^4.1.5",
     "postcss-uncss": "^0.17.0",
     "prettier": "^2.0.5",