Update styleguide to have the on-this-page styling

Author: MinThaMie

package.json

@@ -57,7 +57,6 @@
     "broccoli-funnel": "^2.0.1",
     "broccoli-merge-trees": "^2.0.0",
     "ember-a11y-testing": "^0.5.4",
-    "ember-anchor": "^1.0.3",
     "ember-auto-import": "^2.7.0",
     "ember-cli": "~3.28.6",
     "ember-cli-app-version": "^5.0.0",
@@ -96,7 +95,7 @@
     "ember-route-action-helper": "^2.0.5",
     "ember-sinon": "^4.1.1",
     "ember-source": "~3.28.8",
-    "ember-styleguide": "^8.3.0",
+    "ember-styleguide": "^11.0.0",
     "ember-svg-jar": "^2.4.2",
     "ember-template-lint": "^3.15.0",
     "ember-test-selectors": "^6.0.0",