improve defaults images

Author: cscheid

docs/authoring/brand.qmd

@@ -357,7 +357,7 @@ defaults:
 
 ::::::: {.column-body-outset-right layout-ncol="2"}
 ::: {}
-![Without `defaults: bootstrap` setting](/docs/authoring/images/brand-html.png){.lightbox group="brand-bootstrap-defaults" fig-alt="Screenshot of a webpage. The text is dark grey on a light blue background, using a rounded sans-serif typeface, a logo appears in the navbar."}
+![Without `defaults: bootstrap` setting](/docs/authoring/images/brand-html-no-defaults.png){.lightbox group="brand-bootstrap-defaults" fig-alt="Screenshot of a webpage. The text is dark grey on a light blue background, using a rounded sans-serif typeface, a logo appears in the navbar."}
 :::
 
 ::: {}