Content fix for missing image

https://galaxyproject.org/news/2023-08-07-generic-tabular-plotter/

Above page should likely show interactive Plotly chart instead of this:

<img width="664" height="566" alt="Image" src="https://github.com/user-attachments/assets/a80ab6be-153c-4427-bf4d-c47806cf00dc" />