Release v1.2.0

Updated version for summer term 2025.

Changes in Workflows

• Use pandoc-tex-references for the HTML version

Changes in Lecture

• Fix filter weight computation in sensitivity filtering
• Remove cross products and introduce trace, transpose, and identity better
• Change notation of stresses and strains

Changes in Exercises

• Updated all exercises to work with latest torch-fem release v0.4.2
• Moved plot_contour function to torch-fem entirely
• Simplified Exercise 01 to include more python basics and less tensor algebra
• Modified Exercise 07 to load a CAD file with meshing and solving