move summary outside of a <table> in text/html

[bkamins]

Fixes #2800

[nalimilan]

I trust you that this looks nice? :-)
(CI is failing)

[bkamins]

I did not have time to fix CI yet (to many things in parallel). I opened the PR to let #2800 verify if the tags/classes are as expected. I will finalize it soon.

[bkamins]

@nalimilan - this should be good to merge. I have re-written the tests and also tested under Jupyter Notebook.

@jkrumbiegel - checking if what we have here follows your expectations would be welcome. Thank you!

[jkrumbiegel]

Looking at the code, I think this is good. The outer div can also help when making the table scroll inside the div, in case it's too wide. This is weird to do in css if you only have the table.

[bkamins]

Thank you!