DEV: Fix deprecations (getOwner and router:main) (#157)

assets/javascripts/discourse/controllers/docs-index.js

@@ -408,6 +408,6 @@ export default Controller.extend({
   @action
   returnToList() {
     this.set("selectedTopic", null);
-    getOwner(this).lookup("router:main").transitionTo("docs");
+    getOwner(this).lookup("service:router").transitionTo("docs");
   },
 });

test/javascripts/unit/controllers/docs-index-test.js

@@ -1,6 +1,6 @@
+import { getOwner } from "@ember/application";
 import { setupTest } from "ember-qunit";
 import { module, test } from "qunit";
-import { getOwner } from "discourse-common/lib/get-owner";
 
 module("Unit | Controller | docs-index", function (hooks) {
   setupTest(hooks);