So far we've created two specific views for our website, one for the home page and one for the details of an image. However, there's no consistent UI wrapping both of these pages together. We have no consistent navigation or logo. There's no common footer with standard copyright or additional information.

Usually, with any website that you create, you're going to want to have some form of a standard layout or master template that every page will use. This layout typically includes the website logo and title, main navigation, sidebar (if any), and the footer. It would be bad practice to include the HTML code for the layout in every single page on our website because if we wanted to make even the smallest change to the main layout, we would have to edit every single page as a result. Fortunately, Handlebars helps lessen the work of utilizing a layout file.

Let's create a layout file for our app by creating a new file named main.handlebars within the views/layouts folder and inserting...