fix: exclude images/ from just-the-docs sidebar navigation

Add defaults scope to set nav_exclude: true for all pages under images/
to prevent 'Lab XX Screenshots' entries from appearing in the sidebar.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: emmanuelknafo

_config.yml

@@ -13,5 +13,11 @@ exclude:
   - package-lock.json
   - Gemfile.lock
 
+defaults:
+  - scope:
+      path: "images"
+    values:
+      nav_exclude: true
+
 nav_order_base: 0
 heading_anchors: true