Describe the bug

The diagram showing how the different tables are connected in the nowcasting_datamodel.models.py file is not displaying properly on the package description page of nowcasting-datamodel on PyPI.

The image links under the section for nowcasting_datamodel.models.py are broken, making it difficult for users to understand the structure and relationships between the different models.

To Reproduce

Steps to Reproduce:

1. Go to nowcasting-datamodel on PyPI.

2. Scroll to the section describing nowcasting_datamodel.models.py.

3. Observe the broken image links under the "Models" section.

Expected behavior

The models diagram should render correctly and visually explain how the tables are connected.

Actual Behavior: The images do not load, leaving the section incomplete.

Additional context

Add any other context about the problem here.

If you provide the correct image file path or location, I can help fix the issue by updating the links in the documentation.