SMB Streamline: Tabbed Navigation
This simple plugin is a drop-in block with no configuration. Simply add it to a course in Topics or Weeks format (and all sections shown on the same page) and it will add tabbed navigation to the course. Each tab links to a section (except section 0 which is always shown just below the tabs).
This works with all Bootstrap-based Moodle Themes. Style may need to be adjusted by modifying the block's styles.css.