Refactor plugin to make it fast refreshable

Summary: Refactored Navigation plugin to make it fast-refreshable: moved the main component into a separate file and exported all components as named functions. Without these changes every change of UI triggered full reload.

Reviewed By: timur-valiev

Differential Revision: D29814077

fbshipit-source-id: 5285bdc5f14a5163f9501c0d45a3affefb08fc8e

desktop/plugins/public/navigation/components/SaveBookmarkDialog.tsx

@@ -48,7 +48,7 @@ const NameInput = styled(Input)({
   height: 30,
 });
 
-export default (props: Props) => {
+export function SaveBookmarkDialog(props: Props) {
   const {edit, shouldShow, onHide, onRemove, onSubmit, uri} = props;
   const [commonName, setCommonName] = useState('');
   if (uri == null || !shouldShow) {
@@ -114,4 +114,4 @@ export default (props: Props) => {
       </Sheet>
     );
   }
-};
+}