⬆️ Upgrade build software and dependencies (#48)

* ⬆️ Upgrade build software and dependencies

- Upgrade anaconda to 2025.12
- Upgrade quantecon-book-theme to 0.15.1
- Add jupyter-book version constraint (<2.0)
- Configure Dependabot for conda ecosystem with jupyter-book restriction
- Add nb_merge_streams and path_to_docs to _config.yml
- Temporarily disable build cache for full execution check

* Re-enable build cache after full execution checks

Author: mmcky

.github/dependabot.yml

@@ -11,3 +11,13 @@ updates:
       prefix: ⬆️
     schedule:
       interval: weekly
+
+  - package-ecosystem: "conda"
+    directory: "/"
+    commit-message:
+      prefix: ⬆️
+    schedule:
+      interval: weekly
+    ignore:
+      - dependency-name: "jupyter-book"
+        versions: [">=2.0"]

environment.yml

@@ -3,11 +3,11 @@ channels:
   - default
 dependencies:
   - python=3.13
-  - anaconda=2025.06
+  - anaconda=2025.12
   - pip
   - pip:
-    - jupyter-book==1.0.4post1
-    - quantecon-book-theme==0.14.0
+    - jupyter-book>=1.0.4post1,<2.0
+    - quantecon-book-theme==0.15.1
     - sphinx-tojupyter==0.6.0
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==1.2.1

lectures/_config.yml

@@ -27,6 +27,7 @@ sphinx:
                        'https://www.reddit.com/',
                        'https://openai.com',
                        'https://chatgpt.com/']
+    nb_merge_streams: true
     html_favicon: _static/lectures-favicon.ico
     html_theme: quantecon_book_theme
     html_static_path: ['_static']
@@ -41,6 +42,7 @@ sphinx:
       header_organisation: QuantEcon
       repository_url: https://github.com/QuantEcon/lecture-python-programming.fa
       nb_repository_url: https://github.com/QuantEcon/lecture-python-programming.fa.notebooks
+      path_to_docs: lectures
       twitter: quantecon
       twitter_logo_url: https://assets.quantecon.org/img/qe-twitter-logo.png
       og_logo_url: https://assets.quantecon.org/img/qe-og-logo.png