Feature/remove use back to util (#360)

* Remove "useBackTo"

Not needed

* Use browser back navigation to close the reader

This will cause the previous page (manga or updates) to be opened instead of always opening the manga page

src/util/useBackTo.ts

@@ -1,25 +0,0 @@
-/*
- * 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 { useLocation } from 'react-router-dom';
-import { useNavBarContext } from '@/components/context/NavbarContext';
-
-export const BACK = '__BACK__';
-
-const useBackTo = (): { url?: string; back: boolean } => {
-    const location = useLocation<{ backLink?: string }>();
-    const { defaultBackTo } = useNavBarContext();
-
-    const url = location.state?.backLink ?? defaultBackTo;
-    return {
-        url: url === BACK ? undefined : url,
-        back: url === BACK,
-    };
-};
-
-export default useBackTo;