rdoc/index.html:
  title: API Documentation

/options.en.html#option-syntax-highlighter:
  dest_path: options.html#option-syntax-highlighter

/options.en.html#option-syntax-highlighter-opts:
  dest_path: options.html#option-syntax-highlighter-opts

/options.en.html#option-math-engine:
  dest_path: options.html#option-math-engine

/options.en.html#option-math-engine-opts:
  dest_path: options.html#option-math-engine-opts