fix: declare quiz JSON and H5P as Quarto static resources

questions.json and exam-questions.h5p were returning 404 because Quarto
only copies HTML/image files by default — JSON/binary files need explicit
declaration under project.resources.

Author: thodel

_quarto.yml

@@ -1,5 +1,8 @@
 project:
   type: website
+  resources:
+    - content/intro-lecture/quiz/questions.json
+    - content/intro-lecture/quiz/exam-questions.h5p
 
 website:
   title: dhbern.github.io