Documentation interactivity is broken in /en/latest

[astrojuanlu]

Description

@vladimir-mck noted that there is a Uncaught ReferenceError: jQuery is not defined error, and it turns out it's affecting https://docs.kedro.org/en/latest/, but not https://docs.kedro.org/en/stable/. This makes the hamburger menu to not work (only visible in small viewports), as well as the RTD flyout.

I am not sure what changed, but the source code of /en/stable is loading jQuery:

<script src="_static/jquery.js"></script>

whereas /en/latest isn't.

I've heard of jQuery being dropped from Sphinx, sphinx-rtd-theme, etc at various points (sphinx-doc/sphinx#7405, readthedocs/sphinx_rtd_theme#1253) but I haven't had time to debug whether this affected us or not.

In the meantime, maybe it's worth trying to add it back https://pypi.org/project/sphinxcontrib-jquery/ or find some other solution. Beware of readthedocs/sphinx_rtd_theme#1452.

[astrojuanlu]

Fixed directly in #3192