Add Thunderbird sponsorship banner to home, uploads and download page

app/ui/home.js

@@ -4,6 +4,7 @@ const { list } = require('../utils');
 const archiveTile = require('./archiveTile');
 const modal = require('./modal');
 const intro = require('./intro');
+const assets = require('../../common/assets');
 
 module.exports = function(state, emit) {
   const archives = state.storage.files
@@ -30,6 +31,30 @@ module.exports = function(state, emit) {
 
   archives.reverse();
 
+  if (archives.length > 0 && state.WEB_UI.SHOW_THUNDERBIRD_SPONSOR) {
+    archives.push(html`
+      <a
+        class="w-full p-2 border-default dark:border-grey-70 rounded-default text-orange-60 bg-yellow-40 text-center leading-normal d-block"
+        href="https://www.thunderbird.net/"
+      >
+        <svg
+          width="30"
+          height="30"
+          class="m-2 mr-3"
+          style="display: inline-block; vertical-align: middle;"
+        >
+          <image
+            xlink:href="${assets.get('thunderbird-icon.svg')}"
+            src="${assets.get('thunderbird-icon.svg')}"
+            width="30"
+            height="30"
+          />
+        </svg>
+        Sponsored by Thunderbird
+      </a>
+    `);
+  }
+
   const right =
     archives.length === 0
       ? intro(state)