I lowkey forgot to commit

docs/06-admin-and-settings.md

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+# Admin & Settings
+
+## Site settings (ROLE_ADMIN)
+- URL: `/admin/settings`
+- Manage Spotify credentials stored in DB.
+
+## User management
+- Promote an admin:
+```bash
+docker compose exec php php bin/console app:promote-admin user@example.com
+```
+
+## Appearance
+- `/settings` provides a dark/light mode toggle.
+- Preference saved in a cookie; applied via `data-bs-theme`.
+
+