Remove pandas dependency

[danielhollas]

We should use a more lighter-weight library to generate HTML tables. (we don't do anything else with pandas.

[yakutovicha]

I've started to work on it a little bit with the help of ChatGPT. I will make an initial PR, but feel free to continue working on it. Tomorrow I am off, so might not check it.

[danielhollas]

Thanks for the work! I think this one can wait after the 2.3.0 release since we're anyway be depending on bokeh transitively via ipyoptimade (but the same work should be done there as well to get rid of it).