Change landing page to be /about instead of /explore when trends are disabled (#19414)

app/javascript/mastodon/features/ui/index.js

@@ -54,7 +54,7 @@ import {
   About,
   PrivacyPolicy,
 } from './util/async-components';
-import initialState, { me, owner, singleUserMode } from '../../initial_state';
+import initialState, { me, owner, singleUserMode, showTrends } from '../../initial_state';
 import { closeOnboarding, INTRODUCTION_VERSION } from 'mastodon/actions/onboarding';
 import Header from './components/header';
 
@@ -163,8 +163,10 @@ class SwitchingColumnsArea extends React.PureComponent {
       }
     } else if (singleUserMode && owner && initialState?.accounts[owner]) {
       redirect = <Redirect from='/' to={`/@${initialState.accounts[owner].username}`} exact />;
-    } else {
+    } else if (showTrends) {
       redirect = <Redirect from='/' to='/explore' exact />;
+    } else {
+      redirect = <Redirect from='/' to='/about' exact />;
     }
 
     return (