Replace deprecated node-sass with sass

Author: mrkvon

package.json

@@ -34,7 +34,6 @@
     "eslint-plugin-react-hooks": "^4.2.0",
     "graphlib": "^2.1.8",
     "lodash": "^4.17.21",
-    "node-sass": "^6.0.1",
     "numeric": "^1.2.6",
     "rdf-namespaces": "^1.9.2",
     "react": "^17.0.2",
@@ -87,6 +86,7 @@
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-prettier": "^4.0.0",
     "eslint-plugin-react": "^7.26.1",
-    "prettier": "^2.4.1"
+    "prettier": "^2.4.1",
+    "sass": "^1.49.9"
   }
 }