Add system console switch for enabling link previews (#5663)

webapp/routes/route_admin_console.jsx

@@ -35,6 +35,7 @@ import StorageSettings from 'components/admin_console/storage_settings.jsx';
 import ImageSettings from 'components/admin_console/image_settings.jsx';
 import CustomBrandSettings from 'components/admin_console/custom_brand_settings.jsx';
 import CustomEmojiSettings from 'components/admin_console/custom_emoji_settings.jsx';
+import LinkPreviewsSettings from 'components/admin_console/link_previews_settings.jsx';
 import LegalAndSupportSettings from 'components/admin_console/legal_and_support_settings.jsx';
 import NativeAppLinkSettings from 'components/admin_console/native_app_link_settings.jsx';
 import ComplianceSettings from 'components/admin_console/compliance_settings.jsx';
@@ -180,6 +181,10 @@ export default (
                 path='custom_emoji'
                 component={CustomEmojiSettings}
             />
+            <Route
+                path='link_previews'
+                component={LinkPreviewsSettings}
+            />
             <Route
                 path='legal_and_support'
                 component={LegalAndSupportSettings}