/* NO WEBFONTS, DELIBERATELY, AND THIS FILE IS HOW THAT IS SAID.

   The design system is set in the reader's own interface font -- `--font-sans` is
   ui-sans-serif/system-ui and `--font-mono` is ui-monospace -- so the application downloads no
   font at all and the book must not either. mdBook links `fonts/fonts.css` from every page
   unconditionally and ships Open Sans and Source Code Pro (half a megabyte of woff2) beside it;
   a theme/fonts directory replaces that directory, so this stub is what empties it.

   Deleting this file does not remove the link. It restores the fonts. */