New splash screen.

conversejs/custom/templates/background_logo.js

@@ -0,0 +1,10 @@
+import { html } from 'lit-html'
+import { api } from '@converse/headless/converse-core'
+
+export default () => html`
+    <div class="inner-content converse-brand row">
+        <div class="converse-brand__padding"></div>
+        <div class="converse-brand__heading">
+            <img src="${api.settings.get('assets_path')}/../../images/logo.svg">
+        </div>
+    </div>`

conversejs/custom/webpack.livechat.js

@@ -9,6 +9,7 @@ module.exports = merge(prod, {
     alias: {
       // To override a template, use this syntax:
       // 'templates/muc_sidebar.js': path.resolve(__dirname, 'custom/templates/muc_sidebar.js')
+      'templates/background_logo.js': path.resolve(__dirname, 'custom/templates/background_logo.js'),
       '../sass/converse.scss': path.resolve(__dirname, 'custom/sass/livechat.scss')
     }
   }