The DETOX Theme is based on Andrew Jenkins's Hugo port of a theme by Jordan Bowman: https://themes.gohugo.io/detox/
This theme is really clean and feature-free. It doesn't support tags, navigation links, not even comments. Use it if you want as a basis for a more featureful custom theme or just as a nice focus-on-content site.
You can report issues with this theme and request help via GitHub Issues (themes repository).