When a book download is completed, there is a notification which says file downloaded. When clicking on that, it should open the book in reader.
- Disable showing "Wikisource Reader" as an option to open PDF or EPUB files from external apps like file explorer.
- Check if we should modify the current "File downloaded" notification so as to enable users to start reading the work by tapping on the notification.
- If that is not possible, modify the notification tap behavior to open the library screen so that users can click on "Read" button to start reading.
