Improve visual presentation by hiding code blocks by default

- Set code-fold: true to hide code blocks with toggle visibility
- Add custom "Show code" button text for better UX
- Emphasize visualizations and results over implementation details
- Make notebook more accessible to non-technical users while preserving code access

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: rdhyee

tutorials/zenodo_isamples_analysis.qmd

@@ -5,7 +5,8 @@ author: "iSamples Team"
 date: "2025-09-05"
 format:
   html:
-    code-fold: false
+    code-fold: true
+    code-summary: "Show code"
     toc: true
     toc-depth: 3
     theme: cosmo