Move headlines scss to plugin folder

src/plugins/headlines-view/index.js

@@ -8,6 +8,8 @@ import './view.js';
 import { HeadlinesPanelMixin, HeadlinesPanel } from './panel.js';
 import { _converse, converse } from '@converse/headless/core';
 
+import './styles/headlines.scss';
+
 
 converse.plugins.add('converse-headlines-view', {
     /* Plugin dependencies are other plugins which might be

src/shared/styles/index.scss

@@ -43,7 +43,6 @@
 @import "toolbar";
 @import "roster";
 @import "lists";
-@import "headline";
 @import "messages";
 @import "minimized_chats";
 @import "bookmarks";