Don't make html self-contained to avoid large files

Author: mckeea

DOCS/includes/default.yml

@@ -14,7 +14,7 @@ format:
     include-before-body: ../includes/default-before-body.html
     css: ../theme/styles.css
     code-fold: true # Allow code blocks to be foldable
-    self-contained: true # Embed resources like CSS and images
+    self-contained: false # Don't embed resources like CSS and images
   docx:
     toc-location: before-body
     toc-pagebreak: true