You would think this is something like this is already in the theme but
it turns out it isn't. This should fix pages that are primarily
non-content (i.e., about pages, contact).
The Hugo theme will also generate a counterpart system theme if there's
only one system theme given. Though, it isn't perfect so the release
will not happen for a while. I'll look into generating a color palette
with HSLuv to see if it can be improved.
