Site maps are often called storyboards.

A site map (or sitemap) is a list of pages of a web site accessible to crawlers or users. It can be either a document in any form used as a planning tool for Web design, or a Web page that lists the pages on a website, typically organized in hierarchical fashion.

source: wikipedia

However it doesn’t have to be hierarchical:

The structure you choose has meaning and will influence user experience – but can also be read by savvy interpreters.

Communication through form is more commonly used in multimedia art.

The types of web pages can be marked by a designated shape and explained by a key.

Live action or animations “scenes” are also used to enrich the user experience.

How does this concept of the word “scene” differ from when it’s used in a film script?