I've created a website using the Hayden template and I would like to add a dropdown navigation to the main menu so that users can quickly navigate to a specific section within an index from the menu. Right now, the theme only supports the top level index page to appear within the main navigation, and I would like to be able to reveal the sections within the index in a dropdown menu upon hover. This would likely involve creating anchor tags for the different sections and then referencing them in the dropdown menu, but I'm not sure what code I need to inject in order to achieve this, and how to