refactored css, including some markup changes

app/templates/header/index.js

@@ -0,0 +1,59 @@
+const html = require('choo/html');
+const assets = require('../../../common/assets');
+/*
+  The current weback config uses package.json to generate
+  version.json for /__version__ meaning `require` returns the
+  string 'version.json' in the frontend context but the json
+  on the server.
+
+  We want `version` to be constant at build time so this file
+  has a custom loader (/build/version_loader.js) just to replace
+  string with the value from package.json. 🤢
+*/
+const version = require('../../../package.json').version || 'VERSION';
+
+function browserName() {
+  try {
+    if (/firefox/i.test(navigator.userAgent)) {
+      return 'firefox';
+    }
+    if (/edge/i.test(navigator.userAgent)) {
+      return 'edge';
+    }
+    if (/trident/i.test(navigator.userAgent)) {
+      return 'ie';
+    }
+    if (/chrome/i.test(navigator.userAgent)) {
+      return 'chrome';
+    }
+    if (/safari/i.test(navigator.userAgent)) {
+      return 'safari';
+    }
+    return 'other';
+  } catch (e) {
+    return 'unknown';
+  }
+}
+
+const browser = browserName();
+
+module.exports = function(state) {
+  return html`<header class="header">
+  <div class="logo">
+    <a class="logo__link" href="/">
+      <img
+        src="${assets.get('send_logo.svg')}"
+        alt="Send"/>
+      <h1 class="logo__title">Send</h1>
+    </a>
+    <div class="logo__subtitle">
+      <a class="logo__subtitle-link" href="https://testpilot.firefox.com">Firefox Test Pilot</a>
+      <div>${state.translate('siteSubtitle')}</div>
+    </div>
+  </div>
+  <a href="https://qsurvey.mozilla.com/s3/txp-firefox-send?ver=${version}&browser=${browser}"
+    rel="noreferrer noopener"
+    class="feedback"
+    target="_blank">${state.translate('siteFeedback')}</a>
+</header>`;
+};