Allow disable generating full mobile navigation tree

[imfing]

Discussed in #274

^{Originally posted by dogweather February 3, 2024}
I'm trying to switch from Ananke Theme to Hextra, but I have a weird issue. Every page has a hidden list of links to all the other pages on the site. I have 20,000 pages, so this is a big problem.

It's not just simple <a> tags either: here's a screenshot from the middle of a simple About page. As far as I can tell, I haven't enabled any strange configurations. And what are these line number spans?

The page itself doesn't show anything strange. A megabyte of HTML is hidden in there, though: