Navigation: Add News to top nav (#55466)

* added news feed component

* move button to news component

* create newsfeed hooks and conver NewsPanel to functional component

* added news_feed_enabled and news_feed_url to server settings ini

* add default value in defaults.ini

* set news drawer settings value to true by default

* remove server settings config

* use useToggle hook

* fix newsitem render

* support drawer on mobile screen

* use media query utility

packages/grafana-ui/src/components/Drawer/Drawer.tsx

@@ -163,7 +163,14 @@ const getStyles = (theme: GrafanaTheme2) => {
       .drawer-open .drawer-content-wrapper {
         box-shadow: ${theme.shadows.z3};
       }
+
       z-index: ${theme.zIndex.dropdown};
+
+      ${theme.breakpoints.down('sm')} {
+        .drawer-content-wrapper {
+          width: 100% !important;
+        }
+      }
     `,
     header: css`
       background-color: ${theme.colors.background.canvas};