remove unused packages

Author: mansona

package.json

@@ -99,8 +99,6 @@
     "ember-qunit": "^6.2.0",
     "ember-resolver": "^10.0.0",
     "ember-rfc176-data": "^0.3.17",
-    "ember-route-action-helper": "^2.0.8",
-    "ember-scroll": "^1.0.3",
     "ember-showdown-shiki": "^1.2.1",
     "ember-sinon": "^4.1.1",
     "ember-source": "~4.12.0",