Switch from Converse v10.1.6 to upstream (unreleased v11):

* various WIP to change the Converse version

conversejs/custom/templates/background_logo.js

@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { html } from 'lit'
-import { api } from '@converse/headless/core.js'
+import { api } from '@converse/headless/index.js'
 
 export default () => html`
     <div class="inner-content converse-brand row">