Move "darkTheme" setting to "Appearance" page

src/screens/settings/Appearance.tsx

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { useTranslation } from 'react-i18next';
+import { useContext, useEffect } from 'react';
+import List from '@mui/material/List';
+import ListItem from '@mui/material/ListItem';
+import ListItemText from '@mui/material/ListItemText';
+import Switch from '@mui/material/Switch';
+import { NavBarContext } from '@/components/context/NavbarContext.tsx';
+import { DarkTheme } from '@/components/context/DarkTheme';
+
+export const Appearance = () => {
+    const { t } = useTranslation();
+    const { darkTheme, setDarkTheme } = useContext(DarkTheme);
+
+    const { setTitle, setAction } = useContext(NavBarContext);
+    useEffect(() => {
+        setTitle(t('settings.appearance.title'));
+        setAction(null);
+
+        return () => {
+            setTitle('');
+            setAction(null);
+        };
+    }, [t]);
+
+    return (
+        <List>
+            <ListItem>
+                <ListItemText primary={t('settings.label.dark_theme')} />
+                <Switch edge="end" checked={darkTheme} onChange={() => setDarkTheme(!darkTheme)} />
+            </ListItem>
+        </List>
+    );
+};