Update ``python-docs-theme`` to work with Sphinx 5 & 6 by AA-Turner · Pull Request #99 · python/python-docs-theme

In addition to the inline comments, I have two generic comments:

• The use of semicolons at the end of the line seems inconsistent. Unless there is a specific reason to keep them, I would just remove them all.
• I would avoid the use of if (...) return; or if (...) break; or even if (...) some_functions(). The expression after the condition should go on a new line, and it should be surrounded by { }, e.g.:

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Fun fact: I originally implemented both the collapsible sidebar (~12 years ago in python/cpython#47393) and the copybutton (~11 years ago in python/cpython@59dba38) and since then they have traveled around a number of dirs and repos. It's nice to see that in the meanwhile things got standardized and JS evolved to the point that JQuery is no longer needed.