Revert sass migration PR 457.

This reverts PR #457.
Problems were found and further investigation needs to be performed before this is ready to be in a release.

package.json

@@ -11,7 +11,6 @@
     "DOCKER_SERVER": ""
   },
   "scripts": {
-    "postinstall": "node scripts/post-install.js",
     "build": "ng build --configuration production --single-bundle --output-hashing none",
     "build:clean": "npm run clean && npm run build",
     "build:wvr-elements": "ng build --configuration production wvr-elements",
@@ -129,7 +128,6 @@
     "static-server": "^2.2.1",
     "ts-node": "~10.2.1",
     "tslint": "~6.1.3",
-    "typescript": "~4.3.5",
-    "sass-migrator": "^1.5.2"
+    "typescript": "~4.3.5"
   }
 }