I have a wiki page of short unordered wikilink lists, each under a === heading ===. At the foot of the page and on each of the linked pages is a navbox with almost identical content. Updating the page headings or lists requires keeping the navbox template in sync. Headings are groups and bullets are the lists. The page and navbox can be seen at https://sdiy.info/wiki/Elementary_electronics
Semantic-mediawiki is not permitted, however extension Cargo is, if that's useful.
Instead of keeping it manually up-to-date, how can I get the navbox to auto-update itself whenever the content of the page is changed please?