/* Intentionally empty.

   Atlas uses system font stacks (--font-sans / --font-mono from
   web-shared/atlas-tokens.css), so mdBook's bundled Open Sans and Source Code
   Pro are about 100 KB nobody downloads a page to read. `copy-fonts = false`
   in book.toml drops them; mdBook 0.4.40 warns unless this file exists, so it
   exists. */