Updating Converse upstream (with bootstrap5):

* bootstrap 5 compatibility
* other Converse updates integration
* hack to get the sidebar work as with Converse v10.
* modal onHide was renamed close.
* fix slow mode infobox margin.
* fix margin
* shorter action label, for better dropdown UX.

conversejs/custom/index.js

@@ -8,14 +8,14 @@
  * @description This files will override the original ConverseJS index.js file.
  */
 
+import 'shared/styles/index.scss'
+
 import './i18n/index.js'
 import 'shared/registry.js'
 import { CustomElement } from 'shared/components/element'
 import { VIEW_PLUGINS } from './shared/constants.js'
 import { _converse, converse } from '@converse/headless'
 
-import 'shared/styles/index.scss'
-
 /* START: Removable plugins
  * ------------------------
  * Any of the following plugin imports may be removed if the plugin is not needed