How can I add an icon to every Jupyter cell?

I would like to add an icon on top of the cells in Jupyter. The icon is also a link to another website. I can do this using the custom.js script, but it only works when I reopen the notebook. I would like that every time I create a new cell, it has the icon attached. (By the way, my complete Javascript experience is 20 hours.)

Thanks in advance for your answers!