This mini-site is to support gohugoio/hugo#13588.
The new template system introduced in Hugo 0.146 has a different lookup algorithm to 0.145 and earlier. In particular, it seems to ignore layout = {'single'|'list'} values in section index pages, routing them all to section.html.
This may just be breaking for these specific values, but it is a breaking change in default behaviour that I rely on for <dannorth.net> among other sites.