converting some things to choo/component

app/ui/promo.js

@@ -0,0 +1,39 @@
+const html = require('choo/html');
+const Component = require('choo/component');
+const assets = require('../../common/assets');
+
+class Promo extends Component {
+  constructor(name) {
+    super(name);
+  }
+
+  update() {
+    return false;
+  }
+
+  createElement() {
+    return html`
+      <div
+        class="w-full flex-none flex flex-row items-center content-center justify-center text-sm bg-grey-light leading-tight text-grey-darkest px-4 py-3"
+      >
+        <div class="flex items-center mx-auto">
+          <img
+            src="${assets.get('firefox_logo-only.svg')}"
+            class="w-6"
+            alt="Firefox"
+          />
+          <span class="ml-3"
+            >Send is brought to you by the all-new Firefox.
+            <a
+              class="text-blue"
+              href="https://www.mozilla.org/firefox/new/?utm_campaign=send-acquisition&utm_medium=referral&utm_source=send.firefox.com"
+              >Download Firefox now ≫</a
+            >
+          </span>
+        </div>
+      </div>
+    `;
+  }
+}
+
+module.exports = Promo;