Merge 'struct design' back into 'data structures'

Author: richelbilderbeek

.github/workflows/build_pdfs.yaml

@@ -61,11 +61,6 @@ jobs:
           to: pdf
           path: optimisation/optimisation_lecture/optimisation_lecture.qmd
 
-      - uses: quarto-dev/quarto-actions/render@v2
-        with:
-          to: pdf
-          path: struct_design/struct_design_lecture/struct_design_lecture.qmd
-
       - uses: quarto-dev/quarto-actions/render@v2
         with:
           to: pdf