Simplified variation on the EmberObserver topic for PO

EmberObserver.hbs

<div class="AddonSearch">
  <form data-test-search>
    <label for="addon-search-input">Search For Addons:</label>

    <input id="addon-search-input" />

    <button>GO</button>
  </form>

  <ul data-test-addon-list>
    {{#each addons as |a|}}
      <li data-test-addon-item>
        <span data-score={{a.score}} class="score {{#if a.wip}}wip{{/if}}"></span>

        {{link-to "addons" a.id}}<h3>{{a.title}}</h3>{{/link-to}}

        {{#if a.categories}}
          <ul>
            {{#each a.categories as |category|}}
              <li>{{category.tag}}</li>
            {{/each}}
          </ul>
        {{/if}}

        <span class="last-updated">{{a.updatedAt}}</span>
      </li>
    {{/each}}
  </ul>
</div>