[rewrite] Updated frontend structure and played with custom routes

frontend/src/pages/settings/appearance/index.tsx

@@ -0,0 +1,13 @@
+import ContentSection from "../components/content-section";
+import { AppearanceForm } from "./appearance-form";
+
+export default function SettingsAppearance() {
+	return (
+		<ContentSection
+			title="Appearance"
+			desc="Customize the appearance of the app. Automatically switch between day
+          and night themes.">
+			<AppearanceForm />
+		</ContentSection>
+	);
+}