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/FavoriteButton.tsx

@@ -27,7 +27,7 @@ const FavoriteButtonContainer = styled.div({
   },
 });
 
-export default (props: Props) => {
+export function FavoriteButton(props: Props) {
   const {highlighted, onClick, ...iconButtonProps} = props;
   return (
     <FavoriteButtonContainer>
@@ -42,4 +42,4 @@ export default (props: Props) => {
       <IconButton outline icon="star" onClick={onClick} {...iconButtonProps} />
     </FavoriteButtonContainer>
   );
-};
+}