Right menu does not display the current headings

[jcohenadad]

When clicking on a headings in the right TOC, the page goes at the correct headings, but the right TOC does not. See:

https://user-images.githubusercontent.com/2482071/175317384-c4494f62-af15-4b9e-b597-71bac40d728d.mov

[kousu]

Looks like it's just pages with subheadings. It looks like the right ToC is being synced via javascript based on the current y value on the page, not based on what's clicked (which makes sense), but its estimate is a bit off, and it's falling upwards, selecting the previous heading on for example all of these:

• https://intranet.neuro.polymtl.ca/geek-tips/git.html#send-a-pull-request
• https://intranet.neuro.polymtl.ca/computing-resources/neuropoly/README.html#cpu-gpu-clusters
• https://intranet.neuro.polymtl.ca/geek-tips/misc/docker/README.html#save-a-docker-image-a-id-save-a-docker-image-a

This would probably be avoided if we reconsidered #22, which has much simpler code and is designed to be easier to get right. For example, this sub-subheading (on a site using furo) jumps correctly:

• https://setuptools.pypa.io/en/latest/pkg_resources.html#requirements-parsing