Update to sphinx-exercise 1.2.0 and quantecon-book-theme 0.10.1 (#672)

- Update sphinx-exercise: 1.0.1 -> 1.2.0
- Update quantecon-book-theme: 0.10.0 -> 0.10.1
- Enable exercise_style: "solution_follow_exercise" feature
- Maintenance update for November 2025

Author: mmcky

environment.yml

@@ -7,10 +7,10 @@ dependencies:
   - pip
   - pip:
     - jupyter-book==1.0.4post1
-    - quantecon-book-theme==0.10.0
+    - quantecon-book-theme==0.10.1
     - sphinx-tojupyter==0.3.1
     - sphinxext-rediraffe==0.2.7
-    - sphinx-exercise==1.0.1
+    - sphinx-exercise==1.2.0
     - sphinx-proof==0.2.1
     - sphinxcontrib-youtube==1.4.1
     - sphinx-togglebutton==0.3.2

lectures/_config.yml

@@ -122,6 +122,8 @@ sphinx:
       complex_and_trig: https://intro.quantecon.org/complex_and_trig.html
     # sphinx-proof
     proof_minimal_theme: true
+    # sphinx-exercise
+    exercise_style: "solution_follow_exercise"
     # sphinx-tojupyter
     tojupyter_static_file_path: ["source/_static", "_static"]
     tojupyter_target_html: true