Add trapezoid decomposition animation

[sujaygarlanka]

https://github.com/user-attachments/assets/c50bbdc4-139b-4d8e-b43c-2c56779b8285

[patricknaughton01]

I would move the video and caption to right after the paragraph ending in "unbounded trapezoid to the left of the first vertex and to the right of the last vertex.)" and change the caption to "This video shows a complete example of the decomposition process."