Update JS dependencies (#15033)

* Update JS dependencies

- Update all JS dependencies
- For octicons, rename trashcan to trash
- For svgo, migrate to v2 api, output seems to have slightly changed but icons look the same
- For stylelint, update config, fix custom property duplicates
- For monaco, drop legacy Edge support
- For eslint, enable new rules, fix new issues
- For less-loader, remove deprecated import syntax

* update svgo usage in generate-images and rebuild logo.svg with it

templates/admin/user/edit.tmpl

@@ -133,7 +133,7 @@
 
 <div class="ui small basic delete modal">
 	<div class="ui icon header">
-		{{svg "octicon-trashcan"}}
+		{{svg "octicon-trash"}}
 		{{.i18n.Tr "settings.delete_account_title"}}
 	</div>
 	<div class="content">