replace deprecated react-loadable with suspense

app/javascript/packs/application.js

@@ -60,8 +60,5 @@ ActiveStorage.start();
 // Expose globals
 window.DS = window.DS || DS;
 
-// Now that Turbolinks is globally exposed,configure ReactRailsUJS
 // eslint-disable-next-line no-undef, react-hooks/rules-of-hooks
 ReactRailsUJS.useContext(require.context('loaders', true));
-// Remove previous event handlers and add new ones:
-ReactRailsUJS.detectEvents();