Restore vanilla components

app/javascript/mastodon/actions/onboarding.js

@@ -0,0 +1,14 @@
+import { openModal } from './modal';
+import { changeSetting, saveSettings } from './settings';
+
+export function showOnboardingOnce() {
+  return (dispatch, getState) => {
+    const alreadySeen = getState().getIn(['settings', 'onboarded']);
+
+    if (!alreadySeen) {
+      dispatch(openModal('ONBOARDING'));
+      dispatch(changeSetting(['onboarded'], true));
+      dispatch(saveSettings());
+    }
+  };
+};