chore: update quantecon-book-theme to preview PR #335

- Switch from version 0.13.0 to technical-review-nov2025 branch
- This enables preview of modernization and security updates
- Includes Node.js update, dependency updates, and code organization improvements

Author: mmcky

environment.yml

@@ -7,7 +7,7 @@ dependencies:
   - pip
   - pip:
     - jupyter-book==1.0.4post1
-    - quantecon-book-theme==0.13.0
+    - git+https://github.com/QuantEcon/quantecon-book-theme.git@technical-review-nov2025
     - sphinx-tojupyter==0.4.0
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==1.2.0