separate news feed z index

Author: shawnbusuttil

source/renderer/app/components/news/NewsFeed.scss

@@ -13,7 +13,7 @@
   top: 0;
   transition: margin-right 400ms ease;
   width: 460px;
-  z-index: $dialog-z-index;
+  z-index: $news-feed-z-index;
 
   &.noTransition {
     transition: none;

source/renderer/app/themes/mixins/layers.scss

@@ -1,3 +1,4 @@
+$news-feed-z-index: 10000;
 $backdrop-z-index: 9998;
 $dialog-z-index: 9998;
 $loader-backdrop-z-index: 5;