Update styleguide to have the on-this-page styling

Author: MinThaMie

package.json

@@ -59,7 +59,6 @@
     "broccoli-asset-rev": "^3.0.0",
     "broccoli-funnel": "^2.0.1",
     "ember-a11y-testing": "^5.2.1",
-    "ember-anchor": "^1.0.3",
     "ember-auto-import": "^2.7.2",
     "ember-cli": "~3.28.6",
     "ember-cli-app-version": "^5.0.0",