{% set c = config %}
{% set e = config.extra %}
{% set theme = {
  "logo": e.logo                           | default(false),
  "logo_title": e.logo_title               | default(c.site_name),
  "logo_name": e.logo_name                 | default(false),
  "include_toc": e.include_toc             | default(true),
  "extra_nav_links": e.extra_nav_links     | default({}),
  "show_powered_by": e.show_powered_by     | default(true),
  "sidebars": e.sidebars                   | default(["about", "toc"]),
  "homepage_nav": e.homepage_nav           | default(true),
  "homepage_sidebars": e.homepage_sidebars | default(["about"]),
}%}