Remove "further reading" step from wizard (#10825)

Instead, add link to top themes on meta in wizard's last step.

app/assets/javascripts/wizard/components/popular-themes.js

@@ -1,30 +0,0 @@
-import Component from "@ember/component";
-import { POPULAR_THEMES } from "discourse-common/helpers/popular-themes";
-
-export default Component.extend({
-  classNames: ["popular-themes"],
-
-  init() {
-    this._super(...arguments);
-
-    this.popular_components = this.selectedThemeComponents();
-  },
-
-  selectedThemeComponents() {
-    return this.shuffle()
-      .filter((theme) => theme.component)
-      .slice(0, 5);
-  },
-
-  shuffle() {
-    let array = POPULAR_THEMES;
-
-    // https://stackoverflow.com/a/12646864
-    for (let i = array.length - 1; i > 0; i--) {
-      const j = Math.floor(Math.random() * (i + 1));
-      [array[i], array[j]] = [array[j], array[i]];
-    }
-
-    return array;
-  },
-});

app/assets/javascripts/wizard/templates/components/popular-themes.hbs

@@ -1,5 +0,0 @@
-{{#each popular_components as |theme|}}
-  <a class="popular-theme-item" href={{theme.meta_url}} rel="noopener noreferrer" target="_blank">
-    {{theme.name}}
-  </a>
-{{/each}}