A Table of Contents (TOC) is a automatic list creator using Headings 1-9.
I think, sadly, in your case, it is only part of Xara Designer Pro X.

Alas, Xara doesn't automatically do Sitemaps either in the sense you are thinking (Like Gary's diagram).

You can use something like a web search tool (I use DuckDuckGo Search Box (https://duckduckgo.com/search_box)), which will find everything across all web pages, Conventional or Supersite.

A Supersite, in Xara's words is:
the whole site in a single HTML file) which lets you present your website with animated transitions between pages, or as a vertical or horizontal arrangement of pages, which users can swipe through on mobiles and tablets.
There is nothing to stop you setting up a clutch of buttons for each article/subject in a graphical layout and have that as a Home page with a simple Home link on every other page.
Each Subject could have a simple NavBar to related Aticles.

Acorn